On the football field, Alan Shearer and Roy Keane never saw eye to eye.
Keane won 17 major trophies during his time at Manchester United - including seven Premier League titles.
While playing for Blackburn and Newcastle, Shearer played for one of the Red Devils' biggest rivals for those titles and when the sides clashed, things always got a bit spicy.
The pair captained their sides during a famous 4-3 win for Newcastle over Manchester United in 2001. The pair clashed in front of the East Stand after Keane threw the ball off Shearer.
Shearer said something to the former Republic of Ireland international and he lost his cool, threw a punch at Shearer (and missed) and was sent off in shame.
It is an incident that went down in St James' Park folklore and is still spoken about to this day.
But there was needle between the pair before Shearer even played for Newcastle, as his goals fired Blackburn to the Premier League title in 1995.
Watching a classic encounter between Blackburn and Manchester United while appearing on Gary Neville's Soccerbox, Shearer was asked about his relationship with Keane during their playing days.
Reacting to a confrontation between the pair while Shearer, Neville joked: "That was a battle that never stopped!"
Shearer laughed: "I don't know what you mean!
"I never knew Roy, I only played against him two or three times a year and I didn't know him as an individual who was a fighter and an incredible player.
"He wasn't afraid to dish it around."