Four guys are applying for a job. Only one of them can make it though. So the boss of the company decided to ask them a few questions. The last question decided everything:
What did they think was the fastest thing in the world?
The first man replies: "It's electricity. It moves from one point, to another instantly."
The second man replies: "Its the human thought. We can think of new things in an instant!"
The third man replies: "It's the human blink. It's so fast that we don't even notice that we do it!"
The final man replies: "It's diarrhea!"
The boss says: "Can you explain yourself?"
The man says: "Of course. Before you have the time to think, blink or turn on your light, you already crapped yourself!"

...That man got the job!