Hypno-Toad!
 

You watched it. You can't unwatch it.

(Man, I'm going to have to go back and watch all of Futurama again, aren't I...?)
 

I rewatched "Godfellas" about a month ago. Love that episode. What's fun about Futurama is that my son loves it too and he has yet to grow into all the jokes and references.