Philip Ardagh and Sam Lloyd have both won Roald Dahl Funny prizes for their books, which have been praised as crazy by Michael Rosen, founder of the award.
Philip Ardagh has written more than 70 books for children and is perhaps best known for the Eddie Dickens books.
He has won the prize for Grubtown Tales: Stinking Rich and Just Plain Stinky, illustrated by Jim Paillot, which is about how a plot by the oddball citizens of Grubtown to get rid of the disgusting Manual Org, whose breath smells of "two-thirds of a pickled raw herring, a pickled onion, eleven gherkins and one jar of sandwich spread (one month past its sell-by date)".
Sam Lloyd won the prize for her book Mr Pusskins: Best in Show, a picture book for children aged six and under, about a cat who is determined to win the prize for the best-looking pet.
Michael Rosen, former children's laureate, said: "Mr Pusskins is a cat who could turn into a catastrophe, but instead he's a champ.
Even though he heads for the toilet instead of the cat show, and even though he doesn't realise he's whizzing through an obstacle race, he ends up being the winner. This is a ridiculously funny book, full of mischievous cartooning."
The winners received a cheque for #163;2,500 and a bottle of wine from Roald Dahl's personal wine cellar.