So he can tell if he's coming or going.
Cause it was invented in Alabama! Inspiration came from the comments(http://mobile.reuters.com/article/idUSKBN0GP1NS20140825 irpc=932)
The coming of the Lord.
Don't worry, they'll tell you.
They have a semillon!
About 1 in every 600 million has a chance of becoming a human.
The sock under my bed. (I don't remember where I heard it. Can't claim ownership.)