Made this up myself:
A grasshopper walks into a bar. Bartender says, "We don't serve marsupials here."
Grasshopper: I'm an insect, not a marsupial.
Bartender: Well, you hop like one.
Grasshopper: That's because I drink too much.
Bartender: what's that got to do with it?
Grasshopper: It's the beer. Where do you think I get my hops?