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Spoiler
Many thanks to El Goonish Shive for the banner image.
Give a player a fish, and he’ll probably try to sell it to an NPC fisherman.
Teach a player to fish, and next week he’ll show up with the book, “The Complete Adventuring Fisherman”. He’ll start hunting for some monstrous leviathan to catch and enslave, and he’ll be dual-wielding two fishing poles.