Anyone else have fish that do "odd" things?

[Canuckgod420]

My regal tang would pick up hermit crabs...swim them to the surface, and then drop them.
Then it would race back down to the bottom to grab the hermit again and do the whole over again. On top of all that everytime it sped back down to the bottom it would kick its tail so hard water would splash all over my lights and water would pore down the front glass.
Had to get rid of it.