Mike Tyson understands the fight game as well as anyone.
So he's well-placed to break down exactly what has driven Conor McGregor's unprecedented rise to the top of the UFC universe - and why he's different to other popular champions like Ronda Rousey and Jon Jones.
"Conor is very charismatic," Tyson told fightersonlymag.com. "Jon Jones is bad, but deep down he's a decent kind of person and very shy.
"Whereas this guy, Conor, he's the man. He reminds me of the old-time boxers, one of those guys that's just into everything. He walks into the room and everybody stands up. He sucks the air out of the room. He's just a really interesting guy.
"He does things nobody else has been able to do too. He's kind of like an animated character, one that's real though. He's a great fighter, but his personality is even bigger than his talent. Isn't that crazy? He's got this huge personality. Nobody in MMA has ever had a personality as big as his.