Good Jokes

Joke: Knock knock!
Come in!
You ruined the joke!

Joke: One chemistry student asks another help. The other student says "If this homework was any more basic it would have a pH of 15.

Joke: Mathematician: Hey girl what's your sign?
Girl: I'm a Libra... Why?
Mathematician: I could have swore your sine was π/2, because you're the one.
Girl: No...

Joke: Why are elephants trunks so big?

Joke: Two cows are eating grass in a meadow. One cow asks the other "I've heard Mad Cow Disease has been going around. You worried?"

The other one says "Why should I be? I'm a purple trapezoid."