Fastest Thing In The World

There were 4 guys sitting in a bar. One of them decided to play a little game about what each of them thought was the fastest thing in the world.

Well the first guy says, "I think a Concord Jet is the fastest thing in the world, because it can go faster than the speed of sound."

Well the second guy says, "Well I think I got you beat on that one! I think lightning is the fastest thing in the world, because it can go faster than the speed of light and sound."

Well the third guy says, "Well I believe i have both of you beat. The brain is the fastest thing in the world, because whenever you need something, it is right there for you."

Well the fourth guys clearly states, "Well I have got you all beat! I think the anal sphincter muscle is the fastest thing in the world."

The other three guys say really? Why's that?

And the fourth guys says, "Well I was on a Concord Jet, it got struck by lightning, and I didn't know what to do ... so I shit my pants!"