The FA Cup final, which is also doubling up as Manchester derby, has just kicked off, with City aiming for the first treble since Man United in 1999.
Legendary goal keeper Peter Schmeichel holds the distinct honour of having lined out for both clubs, after playing in that treble winning side before finishing his career at City.
He is also on punditry duty with the BBC this afternoon, where he discussed playing for the two rivals.
One famous tunnel incident was brought up, where his pre-match hand shake was snubbed by Man United captain Gary Neville ahead of a 2002 Manchester derby.
Schmeichel seemed impressed by Neville's intensity, but was quick to add that the fullback also made a massive blunder during City's 3-1 victory.
I mean Gary is a very intense person, and he is such a big fan of Manchester United. He seriously hates Manchester City, so that is the biggest game for him.
He would do anything in order to win the game. Unfortunately for him he didn't have the best game that game I think he gave two goals away.
Peter Schmeichel With A Sly Dig On Gary Neville
— Match of the Day (@BBCMOTD) June 3, 2023
"When you look back now and you're 43, like I am, there's two things about that," said Gary Neville when asked about the incident on the Quickly Kevin, Will He Score? podcast.
"One, he left Man United at the age of whatever he was, 35, and he said he was retiring, basically to go abroad.
"At the time when he came back, he played for Manchester City. You can't play for Manchester City. I'm a United fan and I can't play for Manchester City, I can't play for Leeds and I can't play for Liverpool. That's just written in stone. You just don't play for those clubs, irrespective of what happens.
"He'd won the treble with United in '99, said that he was retiring...he should have carried on playing for United for the next two or three years if that was the case. We struggled for a keeper between Peter and Edwin (Van der Sar)."