DS2009-- D'aww, lol. My fish is a rageaholic, I sometimes grab a mirror and he'll flare at it, then swim around for a good 3 minutes or more flaring at everything around lol. Me, his filter, his plants, the bubbles rising to the surface of his water... Lol. Makes me giggle.
Larsa-- Adorable! I don't overly wanna get mine to jump; just in case he tries to jump in the tank (don't want him hitting the lid, lol)
I've also heard pingpong balls make good toys for them, and it's relatively cheap. If you have live plants, putting in new plants can keep them engaged for awhile too (especially moss balls)
Bettalover2000-- Omgar! I love the one where he goes through the hoop, hehehe!