Just when you thought the title was one team's to lose, it all changes within a weekend.
This has almost certainly been a common occurrence throughout the Premier League season of 2013/14. Chelsea's defeat at the hands of Aston Villa on Saturday proves that there are certainly going to be shocks to come in what is turning out to be a fascinating title race.
This is a Chelsea side that has made a reputation all season - orchestrated by manager Jose Mourinho - of grinding out results when it really matters. However, the despondent and abject nature of the performance against Villa will no doubt worry their fans as to why they can't seal this title for good.
The truth is, it has been happening all campaign.
Many people predicted the Blues - as a result of their outstanding form since the turn of the year - were outright favourites to go on and win the league for the first time since the 2009/10 season.
They may still go on to win it and deliver a third Premier League title for Mourinho. Nonetheless, the evidence that we have seen so far this season suggests that there are a few more twists and turns to come yet.
After all, Chelsea are not the only team to encounter this.
Arsenal were leading the way for over 18 weeks, with Arsene Wenger's team producing tough and gritty wins that one doesn't usually associate with the Gunners. Recently though, they have fallen away and defeats to Liverpool and Stoke especially have provided major blows to a title charge that seemed more promising week-by-week.
Manchester City, meanwhile, boast so much attacking talent. The likes of Sergio Aguero, David Silva and Alvaro Negredo have performed superbly throughout, but the weakness, no doubt, lies in defence.
The performances of Martin Demichelis, Joleon Lescott and even captain Vincent Kompany have been the catalyst in Man City falling behind instead of being way out in front - which is where many think they should be. Their away form is a worry but with victory at Hull on Saturday and games in hand, Man City's title charge is gathering steam again.
Liverpool have surprised many who believed that they would fall away after their lightening start. Defeats to Southampton and Hull had supported this view but the Reds have admirably stayed in touch with the leaders and are producing some sparkling performances.
The partnership of Luis Suarez and Daniel Sturridge - otherwise known as 'SAS' - has produced 42 goals in the league alone this season. They are certainly vital in maintaining the title challenge that few expected come the final 10 games of the season.
With these four contenders running it down to the wire, it is surely going to be an unpredictable and superb season finale.
My pick for the title from the start has been Manchester City.
Though in regards as to who will actually win the league this campaign, well that's anyone's guess.
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