*Father and son are driving to the local supermarket*
Son: Dad, what does it mean to be drunk?
Father: Well, when you are drunk, you can't walk straight, you may talk a little weird, and you start seeing things.
Son: Start seeing things?
Father: Well um, see these four cars ahead of us? When you are drunk, you will start seeing 8 cars in front of us.
Son: Dad?
Father: Yes son?
Son: There is only 2 cars ahead of us...