Fishing

Give a man a fish and he has food for a day.

Teach a man to fish and he has to buy a fibreglass rod, graphite reels, monofilament lines, neoprene waders, creels, tackle box, lures, flies, spinners, worm rigs, slip sinkers, offset hooks, gore-tex hats, 20-pocket vests, fish finders, depth sounders, radar, boats, trailers, global positioning systems, coolers, and

Spoiler:

a LOT of beer.