Mike Tyson signed his contract to fight Roy Jones Jr while smoking a joint.
The two ring legends announced they will clash in an eight-round exhibition bout in Los Angeles on September 12.
The announcement ended months of speculation about Tyson’s return to the ring after he began training.
He had been linked with bouts against old foe Evander Holyfield and former mixed martial artists Wanderlei Silva and Tito Ortiz.
But he will instead take on former four-division world champion Jones later this year.
And in a video posted by Jones on social media, Tyson appears to be smoking a joint as he puts pen to paper.
The 54-year-old has built a £500,000-a-month cannabis empire and has plans to build a 400-acre ranch for his business.
Meanwhile, Jones has admitted he will be David to Mike Tyson’s Goliath after agreeing to take on the heavyweight legend.
“Boxing is a brutal sport, he dominated, he dominated,” he said.
“His legs are huge, his thighs are huge, his arms are huge, his neck is huge, it’s very risky.
“It’s like David vs Goliath; he’s the giant monster we know and I’m the little David who has God on his side, but that’s all I need.”
The pair – who have a combined age of 105 – will fight over eight rounds but neither will go hunting for a knockout.
But while the former world champions will not wear head guards, they will wear larger gloves and will not be seeking to stop each other.
“This isn’t a situation where they’re going out there to try to take each other’s heads off,” Andy Foster, the executive director of the California State Athletic Commission, told Yahoo Sports.
“They’re just going to be in there moving around the ring and letting fans see these legends.”