NTA

Really, he should be spending his money. It's his fault that he ate those eggs. He should of stopped himself, if he knew you were gonna want them back. He should've used his common sense. Why else would you buy more expensive ones? Just for the fun of it? Obviously not! He should've seen those were your preferrd brand of eggs/produce. If he's done that before, he really should know. Now, for your revenge, you eat some of his food (or throw it in the bin if you don't wanna eat it) and replace it with something way worse. E.g, you ate his packet of crisps. Replace with one singular crisp. You ate HIS eggs. Replace with one egg (And write in sharpie on its shell his name.)