It's okay in certain circumstances to ask a celebrity for a selfie if you spot them out and about but you definitely shouldn't just grab them without asking, especially if the person you're grabbing is 'Iron' Mike.
One fan didn't abide by that rule during Floyd Mayweather's win against Manny Pacquiao back in 2015.
For his troubles the fan got an elbow to his chest and a telling off from another member of the crowd, leaving him looking very sheepish.
The fight five years ago was one of the most hotly anticipated clashes for a long time, before it eventually happened, with Mayweather and Pacquiao not meeting until they were past their best.
It certainly wasn't a brilliant fight, especially for the casual fan, but it was a display of excellent defensive boxing from 'Money,' as he took his record to 48-0.
Despite the American's most recent retirement Pacquiao once again talked about wanting a rematch, telling the National, "My people are talking to his people; they're talking to each other. We don't know what the developments are, because I don't have an update yet"
Speaking recently to TMZ former UFC light-heavyweight champion Rashad Evans explained why Tyson would have been just as good in the octagon as he was in the ring, saying, "He could've been amazing, because every single time he lowers his level in a crouch situation, that could've been him faking for a shot and doing a level change, or doing a shot. So, he would've thrown the person off not knowing if he was going for a shot or go for a punch."
"You know when Tyson came up from that crouch position. He was coming up with those hands and that left hook, overhand right. It would've been lights out."
He might be 54-years-old now but there's a reason he was the most feared man in heavyweight boxing.
Just don't grab Mike Tyson, or anyone for that matter.
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