My Cat, the Silliest Cat in the World by Gilles Bachelet.
This is a purely silly book featuring a cat that looks a lot like an elephant.  He acts like any other cat, playing with string, sleeping in a cat bed, and using a litter box, but there are some silly things that this cat does.  He washes himself with toilet water, is scared of mice, and doesn’t land on his feet when he falls.  The illustrations in the book are priceless.  I was laughing as much as my preschooler as we read the book.  It is the perfect silly book to share with any class or group of preschoolers.  I have always had the kids I read to ask for a funny book, and this would be more than silly enough!