Liverpool and Manchester United fans have been in their element over the past week or so, during the build up to Monday night's game at Anfield - trading insults and making fun of one and another where possible.
However, one Red Devils fan has taken the banter to the extreme. After spending six months working on the Reds' new expanded main stand and has left numerous pieces of United memorabilia hiding inside Liverpool's newly redeveloped stand.
Not content with just leaving an old Manchester United shirt within Anfield, the unnamed Red Devils fan also used adhesive to stick to 'bobblehead'-style figures to a steel support on the underside of the stand's new roof and hung the shirt close by.
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The dad of four waited until just a short time before the stand's opening to do pull off the prank, in a bid to get back at the Liverpool fans who he had been working with for half a year.
And now miniature Ryan Giggs and Rio Ferdinand figures will now overlook Monday night's fixture against Manchester United, hopefully, as the only two United fans watching on amongst home supporters!
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The anonymous United fan said: “I was working with a load of Scousers and I thought this would be a good way to wind them up.
"It's all just a bit of good-natured banter. There's a lot of nasty things that get said between the two sets of supporters, but I'm not about that.
"The lads I worked with were great, but every time they tested the public address system, I had to listen to You'll Never Walk Alone.
"I thought I'd leave my own mark on the stadium and remind them who was the best.
"There were quite strict rules about football colours being worn by people working on the stadium, but one day I wore mine under my hi-vis and sneaked it up.
"I had little Giggsy and Rio collectables from a few years ago and they both scored at Anfield in the past so I thought it would be nice to give them a good view of the pitch."
The Lancashire-based worker admits to having spent some of his youth being mocked by Liverpool fans; after being born on the year of the Red Devils' relegation from the top flight. And when the opportunity arose to take revenge, he grasped the opportunity with both hands.
"I basically had to reach the bits that the scaffolding couldn't get to, working on cladding and pipes and things." the former United season ticket holder said.
"Obviously I had to be a bit careful not to get caught but it's all just a bit of fun.
"I was working on the gable end nearest to the Kop, so the thought of the shirt and the two figures overlooking it makes me smile.
"I was born in 1974, the first year United were ever relegated, and where I went to school I was one of only two United fans.
"So this is a little bit of payback I suppose for getting the mick taken out of me when I was younger and United weren't very good. It's just a bit of craic.
"The funny thing is, the very first song they played over the speakers to test them was Roll With It by Oasis, a Manchester band full of City fans.
"It was pretty surreal being 100ft high in your rivals' stadium. Everyone was aware I was a United fan and it was never an issue."
But despite Liverpool finding themselves £100 million down in building costs, and stuck with a United shirt and two 'bobbleheads' in their roof, at least a further 8,500 Reds fans can enjoy the match against their bitter rivals this evening.
Now, jokes and rumours aside, both sets of fans will just hope the game lives up to the hype that has surrounded the fixture over the past week.
Can Liverpool and Manchester United both return to being the dominant forces of English football? Have your say in the comment box below.