Family Guy, Season 5

[Brian and Stewie are at the toilet]

Brian:
How do you think it works?

Stewie:
I have no idea.

Brian:
Look, Lois told me I had to start using the toilet and you're the one who's had potty training, so I'm counting on you to help me.

Stewie:
All right, we're two intelligent guys. We can figure this out.

Brian:
What's that big back part?

Stewie:
Maybe that's where the wizard lives who operates this thing. It would be wise not to anger him.

Brian:
I wonder what this thing is for.

Stewie:
Brian, be careful with that. We don't know what it does.

Brian:
[sighs] All right, here goes.

Stewie:
Oh, God, oh, God. Careful, careful, careful, careful...

[the toilet flushes, frightening Stewie and Brian, who run out of the room]