These are my fish. There are many like them, but these ones are mine.

I suspect everyone, at one time or other, has modified these fish. My implementation replaces the usual innards with a raspberry pi single board computer and a daughter board with some motor drivers and stuff. Its extreme overkill, but that is the right amount of kill.

The final result is that when you press the button (on either fish) they do "Who's on First?". I edited the audio apart so the correct voice comes out of the correct fish, and they syncronize over 802.11 so the timing is correct.