Here is some info on dopefish!
The dopefish, a dumb fish that was one of the enemies in Commander Keen 4 (Keen4e) that has a thought
pattern of "Swim Swim Eat, Swim Swim Eat". It has now appearing in a bunch of games, like the ones here: http://dopefish.com/fishinfo.html.
My favorite screen shot of the Dopefish:
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