It was long-rumored that 74-year-old Vince McMahon personally jumped off a 10-foot platform before WrestleMania 36 to ease Rob Gronkowski's fears ...
Turns out, IT'S TRUE -- AND THE WHOLE THING WAS CAPTURED ON VIDEO!!!
The whole incident was captured by "WWE 24: WrestleMania: The Show Must Go On" [h/t ProWrestlingSheet] -- which shows everything that happened behind WWE's biggest event of the year.
Remember, the event was taped on March 25 and 26 -- and aired on April 5 and 6 -- featuring Gronk serving as the "host" of the 2-day PPV event.