Floyd Mayweather retired from boxing with an unbeaten record in 50 fights without being knocked down.
But the former pound-for-pound king was barged to the ground in a charity basketball game held in Los Angeles.
A basketball player named Larry Williams - also known as the Bone Collector - performed a savage crossover move that made the former boxing champion fall to the ground like a pack of cards.
And Williams, seeing Mayweather on the floor, completed his move by scoring a three-pointer as the crowd went wild about the incident.
The 42-year-old was still lying on the ground in amazement of how he went to down so easily, also with a huge smile on his face.
Meanwhile, Mayweather announced his return to boxing in a social media post after agreeing to a deal with the UFC president Dana White.
"It's true," White said. "We sat at the Clippers' game, we started talking. And we literally got a deal done right there on the court.
"We shook hands. We have a deal, and if things play out the way that Floyd and I think they will, I'll probably sit down with Al Haymon in March and get a deal on paper.
"Let's see how the next few months play out. We could be doing something fun. I think if everything goes our way, Floyd and I would be doing something in October or November."
Meanwhile, it was earlier reported that Floyd Mayweather's son, Zion, has proven to the world that money is not his problem as long as his father is alive.
The 19-year-old showed off photos of his Mercedes SUV, which cost over $40k (R570k) on his Instagram page.
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