Two math students, a boy and his girlfriend, are going to a fair. They are in line to ride the Ferris wheel when it shuts down. The boy says: "It's a sin for those people to keep us waiting like this!" The girl replies: "No - it's a cosin, silly!!!"
Why did the number get mad at his wife? Because she was being irrational
Why did the two vectors start an internet-based company? Because they thought they had a good dot product.
Did you hear that joke about the infinite line? Don't worry, it doesn't have a point!