I went on vacation once and left my sister in charge of my tank. When I came back she had overfed so much that you could barely see my fish. While I was cleaning it my 12" oscar kept attacking me. Once it was clear enough I could see that she had laid eggs.
got chomped by a 7'' Bluefish. Didn't hurt much but I looked down and my finger was covered in blood...wrapped my finger in paper towel and after an hour it stopped. Got stung by a Bullhead once too
not so much a bite as a shock though lol. when i was working at my lfs i saw we got some 4 inch electric cats in. and i was wondering what all the hype about them was, well i found out real quick.
What really hurts is when one is sleeping on a chaise lounge in a lake because it is so hot and psycho fish bites one of your nipples in the middle of the night!