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 skill 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 with the incident.
The 42-year-old was still lying on the ground in amazement of how he went to ground easily also with huge smiles on his face.
Meanwhile, Mayweather announced his return to boxing in a social media post after agreeing a deal with the UFC president Dana White.
"It's true," White said. "We sat at the Clipper's game, we started talking. And we literally got a deal done right there on the court.
"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."