Short and sweet and in chronological order:

Paper boy
Volunteer in a Veterans Hospital
Burger flipper
Hitchhiked across the country
Forklift operator
USAF (one stint, ground radio)
Surboard manufacturer
Commercial fisherman
HBO receiver tuner
Dragline oiler <- the worst!!
Two-way Radio repair
Computers (all OSes, all platforms)
Software test engineer

"Never underestimate the power of human stupidity" - Robert Heinlein