Category: Silly Questions.The proof is in the pudding.This phrase started out as The proof of the pudding is in the eating, which meant that you have to know what’s in the pu... moreCategory: Silly Questions.The proof is in the pudding.This phrase started out as The proof of the pudding is in the eating, which meant that you have to know what’s in the pudding by eating it. It has since been shortened to The proof is in the pudding. It implies that you should take the initiative to learn by examining the evidence that supports the claim yourself.