Mixed martial arts fans never forget.
You could be riding a 10-fight win streak and be on the cusp of a title shot but some people will always be on hand to remind you of the lowest point in your career.
Whether it be a nasty knockout or a slick submission you got caught in, there's always some joker online who will do their best to point it out years down the track.
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Well, it seems Conor McGregor has fallen victim to this sort of trolling as of late.
After appearing to go on some sort of social media hiatus following his devastating defeat to Dustin Poirier in their rematch, McGregor is now back online and providing regular updates for his millions of followers.
With his trilogy bout less than a week away, the Irishman has mainly been posting training clips including the odd shot of him looking pretty stacked with his shirt off - you know, the standard McGregor pictures we're all used to.
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But it seems the former dual-division UFC champion has been aiming a few cheeky digs at long-time rival Poirier too.
Unfortunately for McGregor, whenever he trash-talks his lightweight opponent on social media, his post are immediately met with a barrage of images - or shall we say, just one particular image.
Fans (probably Dustin Poirier supporters) have flocked to the comments section on Conor McGregor's latest social media posts to bombard him with pictures of the UFC megastar curled up on the canvas after being knocked out by 'The Diamond' earlier this year.
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In McGregor's latest Facebook post, he included a picture of his last fight with Poirier where he's tagging the American with a swift jab.
The caption reads: "Gotcha ears."
But savage social media sleuths decided it would be the best time to give McGregor a timely reminder of what happened last time he faced Poirier.
One user posted a picture of McGregor KO'd, saying: "And then I dozed off. Wake me up, please."
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While another posted the same picture, adding: "Wake me up when it's fight night."
This trend carried on with plenty of others jumping on board and ripping into the Irishman.
Even a couple of Khabib Nurmagomedov die-hards decided to chime in.
And when you check out any other of his posts aimed at Poirier, you'll see the same sort of thing occurring with that one infamous image of a KO'd McGregor popping up everywhere.
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Brutal, absolutely brutal.
Thankfully for McGregor, Instagram doesn't allow followers to reply with pictures of their own.
Not sure the Irishman knows you can turn that function off on Facebook too.
That said, he probably loves all the added motivation ahead of his third and final grudge match against his old pal Poirier.
Featured Image Credit: UFC/Instagram/@thenotoriousmmaTopics: Conor Mcgregor, Dustin Poirier, UFC News, UFC, Australia, MMA