Tired of watching your fish evolve in their tank and nothing exciting happening? So get the Piranhaz R/C Battle Fish. One set contains two laser-equipped, remote-controlled plastic fish that can be used to fight each other, with the loser realistically floating back to the surface like any self-respecting dead fish would.

It needs to be pointed out that you should be careful if real fish are present at the time of battle, as the lasers can blind them.

Source: Think Geek