Statistician

Physicist, Engineer and Statistician are out bow-hunting.

They see a stag about a hundred feet away. The Physicist takes a shot, but he forgets to allow for wind resistance and the arrow falls five feet short. The Engineer takes his shot, but he adds too much of a fudge factor and the arrow's five feet too far.

The statistician goes "Nice job guys, we got him!"

When a statistician passes the airport security check, they discover a bomb in his bag. He explains. "Statistics shows that the probability of a bomb being on an airplane is 1/1000. However, the chance that there are two bombs at one plane is 1/1000000. So, I am much safer..."