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Lewis took time out to take pictures with boxing fans at the MGM Grand in Las Vegas, but one person showed everyone how not to act when asking for a photo.
A fan approached him by grabbing his shoulder before holding his fist next to Lewis' face in an awkward encounter.
Lewis immediately moved the fan's arm away then had a few words before shoving him and declining the picture.
The caption accompanied with the video perfectly sums up the situation: "How not to act when asking for a photo, let alone with a heavyweight boxing great."
Tom Gray of the Ring Magazine also said: "You could have the craziest of days, see some outrageous things, but you'll rarely see anything dumber than this. The guy's lucky it wasn't Mike Tyson, he'd be in three pieces."
Lewis was in attendance for Deontay Wilder's successful defence of the WBC title last year.
The Brit is a big fan of Wilder but took exception to the 'Bronze Bomber's' claims he could destroy a young Mike Tyson.
When KO artist Wilder was asked about Lewis' response, he explained why Tyson wouldn't stand a chance against him.
"My hand speed, I'm too long, I'm too tall, my athleticism, my feetwork, all that gives me an advantage, it plays a big part," the 'Bronze Bomber' told EsNews.
"No disrespect to Mike Tyson, in his era he was the best but this is a new era.
"No old-school fighter should beat a new-school fighter. Look at the technology we have.
"Nobody has a natural killer instinct as I do, ain't anybody could ever knock me out. I'm very confident in what I say and I speak what I do."
Wilder told TMZ in his 2018 interview that he would "kick the hell" of a prime 'Iron Mike', who is widely revered as one of the most feared punchers in history.
He said: "Me vs Tyson in '86, I'd kick the hell outta that guy.
"Listen, I've got to keep it real. I know people always go back to the old school or look at the new school and there's no school where I'm not No 1 on Earth."
Tyson initially responded to Wilder's claim in 2018 by dismissing his prediction for the fight between the two destructive punchers.
However, the 54-year-old boxing legend has since broken his silence and properly responded to Wilder over his comments.
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