Nothing is ever guaranteed in football, but there's one thing you can always predict on a Sunday of Premier League action - Piers Morgan will be having his say, much to the annoyance of the rest of Twitter.
It certainly wasn't a result anyone was expecting.
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With the likes of Paul Pogba and Zlatan Ibrahimovic both starting for United, the Red Devils went into the game as huge favourites, with the majority of fans fully expecting them to bounce back from their midweek defeat to Feyenoord.
Jose Mourinho still isn't getting the best out of his new group of players, though, so it was little surprise that rival fans flocked to social media to mock United's latest slip-up.
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In fact, Morgan was one of the few who refrained. Well, he cracked a couple of initial jokes at Mourinho and co.'s expense, before making a very bold prediction:
Not only is it a relief to take a break from his usual berating of Arsene Wenger, Morgan also makes an interesting point about some of United's stars.
Pogba is yet to find his feet at Old Trafford, even if he's in his second stint at the club. Aside from the Watford game, Ibrahimovic has been in fine form, and there's no questioning Mourinho's record - even if he hasn't had the strongest 18 months.
Obviously, we're going to overlook the Rooney comment, because the less said about him the better. Joking aside, though, United might have been written off a little prematurely by some.
Of course, Morgan was never going to leave Arsenal out of the conversation entirely. He's clearly a big Mourinho admirer, so inevitably, the subject of him replacing Wenger did eventually come up - and it sounds like he's rather keen on the idea.
United's upcoming Premier League games are now huge. After welcoming Leicester and Stoke to the Theatre of Dreams in consecutive weekends, they face the small matter of trips to Liverpool and Chelsea. After all, if that's not the time for Pogba to start performing, then what is?
Should United come away from the Leicester game with anything less than three points, serious questions are going to be asked of Mourinho. Yet, just as Morgan says, you wouldn't want to disregard them just yet.
Where do United need to improve? Where will they finish this season? Have your say in the comments.