Chelsea and Manchester United lock horns in the final FA Cup quarter final at Stamford Bridge, with a place at Wembley at stake.
The two sides have played out so many crackers over the years in their epic battles and there have been a whole host of great moments in the games.
We can only hope for more of the same but there's next to no chance that anything will ever come close to the single greatest moment ever to take place in a meeting between Chelsea and Manchester United.
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I am of course talking about the time one Chelsea fan was caught on camera brushing his teeth in the stands.
Chelsea won 1-0 in the crunch clash at Stamford Bridge in November 2009 but the game was undoubtedly overshadowed by the brilliance of the bloke, who had his toothbrush in his mouth and was making sure his gnashers were nice and clean by giving them a good brushing.
The moment happened when the camera panned to a few substitutes as both Chelsea and United were making the changes and the teeth-brushing enthusiast became a viral sensation thanks to his antics.
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Watch and relive the iconic moment here:
Credit: Sky Sports
No matter what happens on the pitch tonight at Stamford Bridge, nothing will ever beat a man brushing his teeth while watching Chelsea and Manchester United in a Premier League game.
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That's what football's all about.
Is the teeth-brushing incident the weirdest thing ever to take place at a football match? Let us know your thoughts in the comments.
Featured Image Credit:Topics: Chelsea, Manchester United, Premier League, FA Cup