Narrowing it down to only one is damn near impossible, but when push comes to shove:
Transformers Movie Intro - 1986 - YouTube
this is 90s cartoons brah.
I think TC was kidding about the whole 90s thing.Amazing movie and series, but this is 90s cartoons brah.
Ahh Real Monsters
Pinky and the Brain
Rocko's Modern Life
The Powerpuff Girls
Dexter's Laboratory