TOM: I know the answer.
RAY: What is it?
TOM: The V2 rocket. 1942.
RAY: Long before that--hundreds of years before that - the common whip.
RAY: And the crack you hear is the tip of the whip breaking the sound barrier. I thought it was one of Mom's famous dope slaps. Because sometimes you never know when those are coming, and just like that, faster than the speed of light...
TOM: Yea, 'cos you could never see that hand coming. Then all of a sudden--Boom--to the back of the head.RAY: Even at her age, 85, she's still able to dish out a dope slap with the best of them.
[ Car Talk Puzzler ]