Straighten Up and Fly Right

This list is so funny, I won't even attempt to add anything to it. So instead, here's a joke free of charge!

Steve is driving down the road when he sees a man standing off in a ditch, yelling something at a grove of trees. Curious, Steve pulls over and steps out of the car. As he approaches the man, he hears him saying:

"And when we don't know the value of a number, we use x as a variable. A variable! Do you understand?"

"What on earth are you doing?" says Steve.

"Why," says the man, "I'm teaching these trees algebra."

"You're crazy!" Steve replies.

"Crazy?" the man shoots back, "Tell me then. How can you expect them to learn calculus without understanding algebra first?"

Ba-dum-dum. Sorry, that one's a work in progress.