After my Apollo (RIP) learned to jump, he got better and better and would jump the second he saw me. Then he started to eat my fingers during water changes (it never hurt and it was really cute). Then he decided to combine the two tricks and attempt to leap out of the water and eat my face during a water change.
He did get to face height, I'll give him that. His problem was re-entry: he missed the tank by a mile and hit the floor. Given that I'm 5'10" he had a long way to fall.
Surprisingly enough, he was ok.
I'm working on teaching my new halfmoon the basics of eating and jumping (hopefully not flying), but there's no point with the sorority girls. When I go in the room, they are too busy begging and showing off to pay attention to me teaching them things. :)