On "Happy Days," the Fonz had a few signature moves. There was the snap that would send the girls swooning by his side. And, of course, pounding the jukebox to make it work.

And there's this:

Fonzie had the magic touch, of course -- and the magic snap. But for those of us who are a little less cool, does smacking a machine really get it going again?

Turns out it does...only sometimes. And usually only temporarily.

Bob Sims is the President of the American Society for Mechanical Engineers and he joins Take Two to talk about why.