The Premier League lead has changed hands 17 times this season, including eight times in the last six weeks, which is more than the previous two seasons put together.
Fascinating
This is a team that's been written off on so many occasions this season and has so far they have come up with all the answers.
However, injuries and suspensions mean Arsenal's resources are going to be stretched over the next few weeks with Liverpool, Manchester United and Bayern Munich looming large in the horizon.
It will be fascinating to see if Arsene Wenger acts on Friday and pulls off another Deadline Day, morale boosting coup just as he did on September 2, 2013.
It won't be easy for the Gunners on Sunday. This is Crystal Palace's first ever visit to the Emirates - the last meeting at Arsenal was a 5-1 Arsenal win in February 2005 and Palace's only ever League win at Arsenal was 2-1 win at Highbury in October 1994 - and they arrive in buoyant mood.
Palace's revival has been one of the stories of the season. Only a few weeks ago they looked set to be cut adrift at the bottom of the table and were long odds on for relegation. Now they are 14th and for the first time this season are not Sky Bet's favourites to be relegated.
Fulham now have that unwelcome berth at 8/11, with Cardiff a 10/11 chance to go down and Palace odds against for the first time at 11/10.
The bottom half of the table and battle to avoid relegation remains a minefield.
Crystal Palace's revival stems back to the game with Arsenal in October. The game came after the departure of Ian Holloway and Arsenal won it 2-0, but Palace were much improved and much harder to beat that day and it served as a platform to go on this extraordinary turnaround that has taken them out of the bottom three.
Palace have won their last two Premier League games and on Sunday bid to win three in a row for the first time in the top flight since 1994. The good work was started under Keith Millen and has been carried on by Tony Pulis.
Palace have won 16 points from the 11 games under Pulis, having won only seven points from opening 12. In that time they've only conceded 10 goals after letting in 21 in the opening 12 games. Arsenal are up against a very different Crystal Palace, who will be hard to break down.
The Gunners might go back to the top of the League on Sunday but if Manchester City go top on the Monday Night Football you wonder if that might the 19th and final time the lead swaps hands
