"I think, therefore I am!" You ever read that crock? It makes no sense but I hear people quoting it all the time.
How about those that don't think? "Therefore they ain't"?
I see those people every day at WalMart walking around in their pajamas with a blank look on their faces. But they DO exist. They IS!
"I think, therefore I am."
That sounds to me like they're cat food. (Iam).