With evidence of Manchester United's terminal decline growing by the week, Arsenal will seldom have a better opportunity to get one over their old rivals at Old Trafford on Wednesday night.
Unai Emery's Gunners travel north on a 19-match unbeaten run and will be seeking to firm up their top four position against a United side lurching from one disappointing result to another under beleaguered Jose Mourinho.
Surprisingly, you have to go back to September 17, 2006 for the last time Arsenal came away from Old Trafford victorious in a Premier League fixture.