[Erasmus]

Barney: Why did the short-hair cross the street?

Clem: What do you mean?

Barney: Err....Because someone told him to. Now: Why did the long-hair cross the street?

Clem: Umm, because someone told him NOT to.

Barney: Oh, well, you heard that one.

Clem: No, I.....

[RobRoy]

You must be thinking of “Ah Clem”. ;)

“Hey, man, he broke the president!”