3rd Edition Dungeons & Dragons: Monster Manual IV
Zack: We need a snake, but what can it do?
Steve: Operate a steamship?
Zack: Steamsnake, good, but not quite what we're looking for.
Steve: The snake I'm thinking of can fly around and spit acid.
Zack: Does it have wings?Steve: Not really. It's like a sail. A big, billowy sail.
Zack: Whoops. Turns out we have all the bullshit dumb snakes we need right now, so we don't actually need any of this stuff.