Chronic farter

[riffer]

Someone told me once that there must be a God. Who else could design a rectal muscle that can tell the difference between a fart and a shit. The delicacy in design, production and product.................proves it.

http://www.heptune.com/farts.html

Skyryder

Or the ones that couldn't tell the difference didn't get to mate (for whatever reason) and over 2 millions years most buttholes now do the right thing...

[YellowDog]

You could get to be famous too!