The Fairly OddParents - The episode was called "Timmy's Secret Wish"

I remember once I got a lot for flak for wishing he actually died in that episode where he wished he'd never been born, but this seals the deal.

you rulebreaking little shit you deserved everything vickey ever did to you.

And let's not forget the episode where it turns out that the world would have been better if he wasn't ever born.