Carl Frampton and Scott Quigg took part in a lively press conference on Thursday ahead of their super-bantamweight unification fight - with a dispute breaking out between the pair over the dressing rooms for the contest.
The two undefeated British world champions meet in a hugely-anticipated clash on Saturday at Manchester Arena, where Frampton's IBF belt and Quigg's WBA crown will be on the line.
Northern Irishman Frampton feels he deserves the best dressing room on the night as he is the "star of the show", his name coming first on the promotional material for the event.
But Bury's Quigg is adamant he should have it, pointing out: "I'm the home fighter."
Frampton claims his opponent's stance on the matter is the result of being superstitious, something he regards as a weakness.
And to ram home the point, Frampton played Stevie Wonder's "Superstition" out of his phone down the microphone towards the end of the press conference.
The two fighters later briefly started pushing each other as they posed for head-to-head photos.
"It's a bit of a laughing matter - on my part, anyway," Frampton said when asked at the press conference about the dressing room issue.
"There is a bit of dispute. Scott wants the dressing room that the star of the show usually goes in.
"Contractually, I'm the A name here. It's Frampton v Quigg. I'm coming to the ring second. I'm entitled to that dressing room.
"He wants it, so I've said why not just lock the door and we'll go into different dressing rooms?
"But I think he's very superstitious, and superstition is a weakness, I think - I don't care which dressing room I'm in."
Quigg then said: "Okay - that's that solved. I'm the home fighter, and I'm in the home dressing room. This is my arena."
Quigg's promoter Eddie Hearn subsequently added there was nothing in the fight contract about the dressing rooms, before Frampton asked his opponent: "If you back yourself so much, does it matter which dressing room you have?"
Quigg responded: "What makes you think you're coming to my arena and choosing what dressing room you have?
"You wanted to be on the left side of the poster, to be announced and come out second. All your demands.
"I'm having that dressing room and that's it. If you want to think it's weakness, you do that."
Frampton replied: "I know it is, and this is about principle."