I like this one.....

A Canadian Soldier was attending some university courses between
deployments.
He had completed tours in Bosnia, and just returned from Afghanistan.

One of the courses had a professor who was an avowed atheist.
One day the professor shocked the class when he came in.
He looked to the ceiling and flatly stated,
"God, if you are real, then I want you to knock me off this platform.
I'll give you exactly 15 minutes."

The Lecture room fell silent.
You could hear a pin drop.
Ten minutes went by and the professor proclaimed, "Here I am God. I'm
still waiting."

It got down to the last couple of minutes when the Soldier got out of his
chair, went up to the professor, and punched him; knocking him off the
platform.
The professor was out cold.
The Soldier went back to his seat and sat there, silently.

The other students were shocked and sat there looking on in silence.
The professor eventually came to, noticeably shaken, looked at the
Soldier and asked,
What the hell is the matter with you? Why did you do that?"
The Soldier calmly replied,
"God was too busy today protecting Canada's Soldiers who are protecting
your right to say stupid shit and act like an asshole, so He sent me."