There's Monkeys in the Walls!

'''There's Monkeys in the Walls! '''is a dream Gary Heffley (Grandpa Heffley in the online book) has in The Third Wheel. In The Third Wheel, Gary Heffley has it in Manny's room, causing Manny to move is bed to the middle of the room. In the online book, Grandpa Heffley has Greg in his room, and when Grandpa shouts it, it startles Greg.

Appearances

 * Diary of a Wimpy Kid (online) (first appearance)
 * Diary of a Wimpy Kid: The Third Wheel (first and only book appearance)