Here's one of mine:
I know it's been pointed out by others before, but one scene that always stood out as ridiculous (amid other ridiculous things no less) was the scene in the climax of The Giant Bacteria where T-Bone crashes the Turbokat into Megakat Biochemical to interrupt Dr. Viper's altercation with Callie:

And the corresponding escape that takes place impossibly quickly:

It didn't seem so much cartoon-ish as lazy to me, as if the writers/director/production people couldn't come up with something better (or were short on time and unable to do something better that they meant to do).