Ok so my biggest girl Big Red i've had for about a month, and I accidentally taught her to jump out of the water and hit my hand LMAO! She did it this morning and I just started laughing. She has a pesky tank mate (mini feeder goldfish) that likes to eat EVERYTHING. In order to make sure she got food she'd either have to be on the other side of the tank or really fast (she's not that fast). To compromise (for her) I would hold my hand right above the water until she was right under it and drop food. I've been doing this a day MAX, and this morning she decided that she would jump and hit my finger, obviously excited about food, but now I can get her to do it every time! I taught my fish a trick! I'll try to take a video and get it on here later.