Manchester United play Liverpool on Monday night, a fixture that raises the hackles of both sets of supporters.
In the buildup to the Manchester derby, the attention of the whole football world focused in on the new battleground for the club-hopping clash between Jose Mourinho and Pep Guardiola. United, of course, lost that one fairly convincingly. It was frustrating. It was a little embarrassing. It might yet end up being costly in terms of the title race.
But it was not as bad as losing to Liverpool.
United fans; which rivalry means more to you?