Fulham suffered a shock third round exit from the FA Cup on Sunday after losing 2-1 to League Two outfit, Oldham Athletic.
Denis Odoi gave the Premier League side the lead early on in the second half and it looked as if they would cruise through to the fourth round.
However, Sam Surridge levelled from the penalty spot with 14 minutes remaining to set up a grandstand finish.
Aleksandar Mitrović had the chance to send Fulham through when they were awarded a penalty of their own, but the Serbian striker saw his effort saved by Daniel Iversen.
And the League Two side made him pay, with Callum Lang netting minutes later to ensure Oldham pulled off a dramatic victory.
Mitrovic will probably be disappointed he did not convert his penalty.
He had the opportunity to give Fulham a late lead which the Premier League side would surely have held on to.
But, he failed in his attempt, meaning he has to take a share of the blame for their exit.
A number of punters will also be upset with Mitrovic.
Fulham were expected to easily beat the League Two outfit but they suffered a shock defeat.
It turns out that his missed penalty actually cost one punter £855.
Taking to Instagram, @JamieBlyth10 sarcastically thanked Mitrovic for making him lose his bet.
But, unexpectedly, Mitrovic saw his post and said 'no problem'.
When reminded that Mitrovic lost him £855, the Serbian then replied that he knew that was the case.
Take a look at the exchange below:
That is gold.
It seems Mitrovic has actually taken pleasure in the fact that one fan lost a bet because of him.
Football fans saw the exchange and praised the Serbian striker for not caring at all.