Dumb Bunnies is a series of books created by Dav Pilkey, the author of Captain Underpants, under the pseudonym "Sue Denim". They involve the adventures of a dumb family of bunnies. The Dumb Bunnies did everything in reverse, including sleeping under beds and putting flowers upside down in vases.
The series is said to be mocking or parodying books like Good Night Moon by Margaret Wise Brown and The Stupids Step Out by Harry G. Allard and illustrated by James Marshall.