
12. UFC 229 Brawl
First of all, we’ve got to say that McGregor didn’t start this. That lies entirely at Khabib’s feet. But it was still one of the most embarrassing moments in UFC history. Televised to millions around the world, it was a real facepalm moment for the promotion. But that wasn’t the most cringe-worthy part.

After the brawl, McGregor released a lengthy tweet basically saying he had destroyed two of Khabib’s teammates who came after him. In short, he was trying to deflect attention from his bad beating by Khabib. Needless to say, fans saw right through it. Sometimes it’s just best to say nothing.