Punch line to the greatest joke EVER! Combination of "elephant" and "rhino". Pronounced "hell if I know".
Grandpa Joe: What do you get when you cross an elephant and a rhino?
Me: I don't know. What DO you get when you cross an elephant and a rhino?
Grandpa Joe: HELLIFIKNOW!
Me: HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA! If that were any funnier, it would have to be banned by the FCC like anything else that's funny!