Gronk was leaving 1Oak on the Sunset Strip when some guy cut in front of the NFL star and tried to bee line it for the waiting bus. 

On his way to the bus the mystery man collided with a waiting female … sending her crashing to the ground. But the man continued on his way and GOT INSIDE Gronk’s ride. 

Moments later, once Gronk got on board — security was called over … and a frighteningly large man with an earpiece can be seen removing the intruder from the Gronk-mobile. 

TMZ captured video of the incident below. We don’t know what that guy was thinking, because it’s not like that bus fits a hundred people. Everyone probably got into the bus and was like hey wait a minute..

Oh well, you miss 100% of the shots you don’t take right? Can’t say I blame him, either. I’d want to party with the Gronks too..