Heh, there was one that I clearly remember, when I heard it I swear my eyes popped out and my mouth dropped. But it was P&TB, at the beginning, Brain had just described his plan to Pinky. Pinky was holding a tube of caulking (it said Caulk on the side), and he was rubbing it with one hand. As he did this some of the white caulking came out of the tip, and Pinky said: "Mmmmm, delicious caulk." I couldn't believe it at the time.