PROOF THAT ALL ODD NUMBERS ARE PRIME:
Mathmatician -- 3 is prime, 5 is prime, 7 is prime, the rest follows by induction.
Statistician -- 3 is prime, 5 is prime, 7 is prime, 9 is expermental error so throw it out, 11 is prime, 13 is prime, the rest follows by induction.
Computer Scientist -- 3 is prime, 5 is prime, 7 is prime, 9 is prime, ....
*Thanks Beth Clarkson from Boeing. I still think it is a good joke!