He'll learn...a guy I used to work with at a pet store told me how his Oscar would always try to bite him during water changes. The Oscar got him more on one occassion let's just say. He finally got tried of it and pinned his Oscar to one side of the tank with a net and talked a lot of trash to it

I don't advocate pinning your Oscar down, but it was pretty funny to see a full grown man yelling at his Oscar, "I FEED YOU, AND I CLEAN FOR YOU, YOU LITTLE F*CKER! DON'T YOU EVER EVER F*CKIN' TRY BITING ME AGAIN OR NEXT TIME I'LL HIT YOU WITH A FRYING PAN AN THEN THROW YOU IN IT WITH SOME GARLIC BUTTER!!!"