I've only had my betta for four days but he already jumps out of the water a bit to grab food. (Discovered this by accident yesterday). I don't know if I want to encourage him to jump more, though. He's in a covered tank of course, but still... As much as he loves food, he could probably be "trained" in some way if food was used as a reward.
I will be curious to see what other people's responses are.