Honestly, I was low-key expecting Man UTD to turn the game around like they are used to doing but it's safe to say that Grimsby came all out for them I have to say that this has been the longest penalty shootout that I've witnessed in a long while and even though Man UTD tried all they could do to ensure they come out being the winners via penalties, today was just not their day. Wow, football can be really unpredictable.
In the end, Man United lost despite trying to equalize the score to 2-2, but they were unlucky in the long penalty shootout. 
Some people questioned what happened to the Man United team causing them to lose to the underdog team.
It is possible that with this defeat more fans will be fed up with the result even though it is a small tournament, the defeat of a big team still causes ridicule.
In competitions like this, no matter how small the team is, you have to play it like it's the finals because aside from the fact that these smaller sides would be happy that they qualifed, it would also be a thing of pride to note that they were able to beat a big club in the EPL and not a club in the same ranks as them.