It was when Regal was in WCW. He'd gone out in Vegas, drinking, drugs, and all that other stuff, but he'd also been booked to do the rounds on morning radio promoting the show. He does one show that was hosted by Kevin Dubrow. It all starts off pleasant enough, but then Dubrow asked him who he listened to, Regal said that he'd always been a big fan of the british glam rock, like Sweet, Wizard, and Slade.
Kevin Dubrow said "Slade? Yeah, I made those guys a tonne of money!" because Quiet Riot covered 'Cum On Feel The Noize" and "Mama Weer All Crazee Now" (that's how those songs were actually spelled, Slade must have been Lakersfan's english teachers). This got Regal's back up, and said "Don't you mean that THEY made YOU a lot of money?! Your biggest hits were their songs!" Dubrow then says "Hey! You don't need to be like that!" and Regal just lunged at him, and got him round the neck, and said "I'm gonna rip that fucking syrup of your head!!"
Regal was fired from WCW not long after that.