Back when Rob Gronkowski was retired from football and doing the whole professional wrestling thing, he had some trepidation about diving off a 10-foot platform in Wrestlemania rehearsals. Until 74 year-old boss man Vince McMahon decided to show him how it was done - literally - in this recently-released video. After that, Gronk was able to psyche himself up to take the fall. (Photo by Mike Ehrmann/Getty Images)