Trying to find a screenshot of a Simpsons scene... Help?

Trying to find a screenshot (preferably somewhere online) where Bart was caught doing something bad, Marge was giving him a lecture, so Bart put a pot over his head covering the ears and is banging on the pot so he can't hear a thing Marge said.

I know it happened, I've seen it, but I can't seem to find such a screencap online. Any body seen it before?