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Warning: Do Not Open This Book!

Illustrated by Matthew Forsythe



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About The Book

An E. B. White Read-Aloud Honor Book
An ALA Notable Book
A Huffington Post Notable Book

CAUTION! This book contains monkeys, alligators, and a whole lot of silliness.

You really shouldn’t be opening this book.
I’m serious.
Just put it back on the shelf.
You’re still reading this?
Well, don’t say I didn’t warn you...

It looks like a book, it feels like a book, and it even smells like a book. But watch out...madness and mayhem lie within! Debut author Adam Lehrhaupt urges you NOT to take a walk on the wild side in this humorous, interactive romp with inventive and engaging illustrations from Eisner Award–winning comic artist and rising star children’s book illustrator Matthew Forsythe. Warning: Do Not Open This Book? won the E.B. White Read-Aloud Honor award and was a 2013 Huffington Post Best Picture Book honorable mention and an ALA Notable Children’s Book.

This quirky, subversive creation begs to be enjoyed again and again and again.

“These monkeys are a RIOT! And their books are funny, too!” —Ame Dyckman

About The Author

Photograph by Steffen Thalemann

Adam Lehrhaupt’s first picture book, Warning: Do Not Open This Book!, received the E.B. White Read Aloud Honor Award, was an ALA Notable Book, and a HuffPost Notable Book. School Library Journal called it, “More fun than a barrel of monkeys.” He is also the author of Please, Open This Book!, which was named a Wanda Gag Comstock Read Aloud Honor Book, and Idea Jar. Adam has traveled to six continents, performed on Broadway, and lived on a communal farm. He currently lives in the suburbs of Philadelphia, Pennsylvania, with his wife, sons, and two bizarre dogs. Visit him online at

About The Illustrator

Photo courtesy of the author

Matthew Forsythe is the author-illustrator of Pokko and the Drum, a Publishers Weekly Best Book of the Year, a recipient of the Boston Globe–Horn Book Award Honor, and a Charlotte Zolotow Honor Book. He is also an illustrator for animated films and television. His credits include Adventure TimeThe Midnight Gospel, and Robin Robin, a stop-motion animated musical from Aardman Animations and Netflix. Visit him at

Product Details

  • Publisher: Simon & Schuster/Paula Wiseman Books (August 27, 2013)
  • Length: 40 pages
  • ISBN13: 9781442435827
  • Grades: P - 3
  • Ages: 4 - 8
  • Lexile ® AD300L The Lexile reading levels have been certified by the Lexile developer, MetaMetrics®

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Raves and Reviews

Lehrhaupt’s debut predictably counts on curious readers to ignore the dire warning and its accompanying threat, “You don’t want to let the monkeys out.” As pages turn, lemurs, baboons, and rhesus monkeys stalk into the spreads, where they pluck at the printed words and paint trees for themselves. The narrator’s uninspired pleas to readers (“Can you stop now? Everything used to be so good”) scaffold Forsythe’s (My Name Is Elizabeth!) primitive, earth-tone watercolors of the escalating melee. When a flock of toucans joins the troublemaking monkeys, and a giant alligator emerges from the right margin, readers get to be part of the solution: “You can catch them all in this book!” If Forsythe’s grainy illustrations echo Jon Klassen’s picture books, the mood in this outing is light and message-free.

– Publishers Weekly

Children won’t be able to resist the urge to turn the page as they wade through caution tape, warning signs, and scenes of chaos. The madcap mayhem includes monkeys stealing the illustrator’s tools to paint their own drippy forest, a flock of swooping toucans, and an alligator sprawled across several spreads. Only the introduction of a banana trap can possibly save the story. The witty text is direct, and the art soars and leaps as much as the animals. Forsythe’s digital art features a subtle palette of browns and grays and the characters are rendered in a bold contemporary style with simple broad strokes. In the grand tradition of books that warn children away from reading them ... this one invites readers into the action. More fun than a barrel of monkeys

– School Library Journal

Debut author Lehrhaupt and New York Times Notable Children’s Book illustrator Forsythe (My Name Is Elizabeth!, 2011) team up for a laugh-out-loud romp through monkey-infested pages.

From the title and the endpapers’ warning signs (“I guess you don’t mind being mauled by mo___s”) to the opening pages’ admonishments not to venture further, the narrator repeatedly warns readers not to open this book. Those who do not heed these pleas release a troop of artistic monkeys that wreak havoc on the book itself. Nothing is safe from these wild invaders—not the art and not the text. When the narrator again urges readers to turn back, toucans join the fracas. Forsythe uses the same warm palette for the toucans as the monkeys, adding a nice continuity to an otherwise strange addition that slows down this well-paced story. Before the toucans can do much, an alligator shows up, frightening everyone. With chaos reigning supreme, the narrator turns to readers for help in laying out a plan to snare the animals inside the book. Forsythe’s digitally rendered art is hilariously expressive and laugh-worthy in its own right, and it is well-paired with Lehrhaupt’s spare comic text, successfully creating a book that is enjoyable both to read and behold.

In the tradition of humorous metafictive offerings of the past, this celebration of chaos is a veritable festival of fun.

– Kirkus Reviews

Audiences are warned right away about about opening this picture book: “You don’t want to let the monkeys out.” The intrepid and curious, though, will forge on to find a single monkey poking his head in from the edge of the page—followed by a barrage of monkeys on the next, who muck everything up by fiddling with the text and splashing paint all over the illustrations. Continuing (and ignoring the narrator’s pleas to stop) leads to a slew of similarly invasive toucans and finally one very large and scary alligator. All hope seems to be lost until the narrator has an idea: “Only you can make things right. You should set a trap!” Once the trap, a banana, has been rigged, audiences can then slam the book shut with squeals of glee, keeping the mess of creatures stuck inside... Forsythe’s earth-toned, messy digital illustrations escalate along with the text, starting with warning signs against an austere white background but, as the critters get out of control, becoming full-bleed chaos. The art is also also reminiscent of a kid’s watercolor paintings, a feeling enhanced by the blob-shaped monkeys and wonky alligator—and the fact that the monkeys themselves draw the trees in the background. Kids following along will relish the exhilaration of breaking the rules as well as the simple but clever means of cleaning it all up. Expect the titular exhortation on this one to be thoroughly ignored again and again.


Starred Review

Warning: Do Not Open This Book!

by Adam Lehrhaupt, illus. by Matthew Forsythe

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In the spirit of Press Here and other inventive books that play with the possibilities of the page turn, this debut from author Adam Lehrhaupt unequivocally warns children to close this book and turn away from it. So... kids won't be able to resist, just to see what their act of rebellion yields.

"Maybe you should put this book back. You don't want to let the monkeys out," the book begins. Matthew Forsythe (My Name Is Elizabeth!) draws a wide-eyed monkey on a sign that says "DANGER." When children inevitably turn the page, they are greeted with, "Why did you turn the page? Didn't you see the warning? Stay on this page. You are safe here." Signs that read "Stop," "Go Back" and "U-Turn," plus barbed wire and orange pylons, suggest that readers proceed at their own risk. On the next page, a monkey appears from stage right ("Oh, no. Now you've done it"); others follow. They parade onto the pages wielding paint cans, tubes of paint and brushes ("What a mess! Naughty monkeys"). While the story warns against impending doom, children will delight in the consequences of each page turn; the monkeys' artwork results in a lush and tropical landscape of gold, forest green and burnt orange. Everything halts due to the entrance of a predator, and it's up to readers to save the naughty monkeys.

Lehrhaupt delivers a brilliant conclusion to this hilarious romp, which involves readers to the very end. --Jennifer M. Brown, children's editor, Shelf Awareness

Discover: A picture book that warns children to walk away from it--ensuring they'll eagerly turn every page to view the consequences.

– Shelf Awareness

Reverse psychology runs rampant in this amusing collaboration between first-time author Lehrhaupt and award-winning illustrator Forsythe. Opening this book is like venturing into a cordoned-off danger zone. Those who disobey the cover threats are met with four pages of comically dire signs: “Come On . . . Seriously?” and “I Guess You Don’t Mind Being Mauled by Monkeys.” There’s a catch-your-breath moment after the reader turns the next page, quickly followed by a riot of monkeys barreling across a double-page spread, toting paints, crayons, and a guitar. The narrator implores the reader to get out before things get worse. And they do get worse, with the destructive monkeys being followed by toucans and an alligator that opens his jaws very, very wide. At last, the narrator supplies the reader with an ingenious way to lure the whole zoo back into the confines of the book. The earth-tone digital illustrations well replicate the messy monkey business of painting all over the trees and pages, and the playful arrangement of text adds greatly to the book’s mayhem. Wonderful chaos.

– Booklist

Awards and Honors

  • ALA Notable Children's Books
  • South Carolina Picture Book Award Nominee
  • Bank Street Best Children's Book of the Year Selection Title
  • Irma S Black Semifinalist (Bank Street)
  • ABA E.B. White Read-Aloud Award
  • Huffington Post Best Picture Book Honorable Mention

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More books from this author: Adam Lehrhaupt

More books from this illustrator: Matthew Forsythe