King Hugo’s Huge Ego by Chris van Dusen

From chapters.ca: From a master of visual comedy comes the royally satisfying tale of a head swollen out of proportion and a blowhard brought down to earth. Hugo is a tiny king with a very large ego. But when he mistreats a villager who also happens to be a sorceress, the spell she casts causes his head to literally swell. The more he boasts, the bigger it gets, until it finally topples the mini monarch right off his castle! Who will cut this royal pain down to size? And, more important, will anyone live happily ever after? Chris Van Dusen's hilarious story is matched only by his outrageous illustrations. Together, they make for a picture book that is sometimes fairy tale, sometimes cautionary tale, and always laugh- out loud funny.