There are two blondes walking in a park. One looks down and says to the other "Hey look, those are wolf tracks, see?"
The other looks down and says "No those are deer tracks; I've seen them before."
"I swear to you that those are wolf tracks."
"I'm telling you, those are deer tracks. I'm positive."
They keep on arguing, and half an hour later, they're both killed by a train.