Q: How many professors does it take to replace a lightbulb?
A: One: With eight research students, two programmers, three post-docs and a secretary to help him.
Q: How many mathematicians does it take to change a lightbulb?
A: Ten: One to do it and eight to watch.
Q: What do you get when you cross an elephant with a banana?
A: Elephant banana sine theta in a direction mutually perpendicular to the two as determined by the right hand rule.
Ralph: Dad, will you do my math for me tonight?
Dad: No, son, it wouldn't be right.
Ralph: Well, you could try.
Q: Why did the calculus student have so much trouble making Kool-Aid?
A: Because he couldn't figure out how to get a quart of water into the little package