haha nah it doesnt sound stupid, i heard of a guy who rigged up a bell just above the waterline of his oscar tank. everytime he fed them he would ring the bell first, and eventually they got the hang of it. whenever they were hungry they would splash the bell with water and try and make it ring. he must have got annoyed after a while though...caus oscars are always hungry
hold a piece of food over the water see what happens! (watch your fingers)....for every action there is an equal and opposite reaction! (you need to keep the lid tight otherwise you will have oscar jerkey in the morning)
My friend would put pinpong balls on one end of the tank and his Oscar would bring it back to him then get fed. Food is the best way to get your Oscar to do tricks, mine jump out of the water for food but thats it, I don't want to teach them and they don't want to learn its a mutual agreement. The best trick is I feed them and they'll be good.