A
cousin of mine told me a
joke similar to this while I was in college studying
computer science. During this time I was quite the "extreme"
rollerblader. I would jump off large
concrete structures, ride stairs, and generally do dangerous things all without a
helmet.
The joke my cousin told me was:
Q:What do you call a Scientist that hit his head on a curb?
A: Janitor
Needless to say, I was the proud owner of a brand spankin' new helmet the next day.