The Manchester derby ended scoreless, but Marouane Fellaini brought some drama to a disappointing spectacle when he saw red for a headbutt on Sergio Aguero.
Manchester United midfielder Fellaini was booked just a minute earlier before referee Martin Atkinson gave him his marching orders for the incident with the City striker.
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Fellaini's red card was met with disdain, disillusionment and disappointment by United fans on Twitter, while rival supporters were quick to enjoy his dismissal.
Fellaini will now miss Sunday's game with Swansea City, but may face longer on the sidelines.