I've been bit several times over the years but I got a few that stick out in my mind
My Puffer (A. Hispodus)at about 10" long bit the tips of my thumb, 1st & 2nd finger while I was feeding another fish. I was holding a feeding probe with a piece of shrimp on the other end to feed an eel at the bottom, the tips of my fingers were barely in the water at the surface. I was watching the eel, not the puffer, he got me good!!! My skin was hanging off my 1st finger.
The best thing I ever had happen was in my shop. This lady would come in regulary with her out of controll son. He would run around the shop banging on the tanks, opening lids, putting his hands in the water, etc, completly out of controll. I would ask the lady to get her kid under controll, her best attempt was to tell him to stop, it didn't do any good though. THis went on for about a year untill one fatefull day... another customer of mine traded in the biggest Dovii I have ever seen, it was the biggest, meanest fish I've had in a very long time. It would not cohabitate with other fish so I put it in a 40 long on the bottom row of tanks by him self. I was feeding the fish when this lady and her out of controll kid came in, I unintentially left the lid open on the dovii's tank. THis kid does his regular routine and puts his hand in the dovii's tank and WHAM!!!!! That Dovii bit the hell out of him. It left fang marks on the back of his hand!!!! Man that was cool!!!! It was all I could do not to laugh my ass off. THe woman paniced, the kid was crying and bleeding, it was great...I calmly said to her, "this is why I've been asking you to keep you kid under controll....I really hope my fish is OK" THey never came back to my shop after that....