How many do YOU have?

College boy: Try plugging it into the other hole.
Trig. Prof: The other hole?
College boy: Do you have two holes at the top?
Trig. Prof: No, well, I do, just this one and this big one...

On a totally different topic, has anyone seen my new puppy recently?

Trig. Prof: Did anyone come by my office yesterday?
Class is silent
Trig. Prof: Good, my office stinks. I think an animal died in there...