Because they're funny on many levels.
I'll tell you later.
Because if his punch line doesn't work, you still get a kick out of it.
By looking over your shoulder.
Because he is dead. ((I came up with this joke when I was very tired.))
One can raise a child
They get in an elevator to lift their spirits.
He who makes a mistake in an elevator is wrong on many levels.
I'm gonna level with you.
