Butthead

Ever wondered where the butthead came from?
Well - it all started like few millions years before dinosaurs.
Back than God was very angry for Adam for pulling Eva's hair and for making her cry. He took first creature he could find in Eden that was ugly enough and put Adam's butt at it's head. 

- maybe that's how U will learn to be nice to your girl - he said

It took millions of years for man kind to be who we are now but still randomly we can find butthead among us.
It's also clear that it's not so easy nowadays to recognize them so quickly.