Jim Nantz tries a "Peanut Punch" on J.J. Watt in the CBS booth and jokes his wrist is broken

Jim Nantz has called Super Bowls, Final Fours and the Masters. On Sunday he found out the hard way that forcing fumbles is a lot tougher than describing them.

A booth demonstration gone wrong

During CBS' broadcast of the Buffalo Bills at the Las Vegas Raiders, analyst J.J. Watt was showing viewers how running backs are holding the football tighter than ever this season. To prove his point he tucked a ball against his body and invited his partner to try to knock it loose with a "Peanut Punch."

Nantz did not hold back. He wound up and gave the ball a full swing.

The ball did not move. Nantz's hand did. He winced, shook it out and delivered the line of the day.

"My wrist is broken," he joked. A laughing Watt admitted he did not expect such a big swing. "I did not think you were gonna go that hard," he said.

Fans put Nantz on the injury report

The clip spread across social media within minutes. Fans joked that football had gotten so physical that even the play-by-play man was now on the injury report. Others said the 67-year-old deserved credit for his dedication to the bit.

A little later a photo showed Nantz holding ice on his wrist. As far as anyone can tell he came away with nothing worse than a sore hand and a great story.

Where the move comes from

The Peanut Punch is named after former Chicago Bears cornerback Charles "Peanut" Tillman. He made a career out of punching the ball free from ball carriers and forced 44 fumbles in his NFL career.

Watt was best known for chasing quarterbacks. But he also caught three touchdown passes in his career so he knows how to hang on to a football. Nantz now knows it too.