Conor McGregor didn’t take kindly to a hat that was thrown his way during his birthday celebration. 

After a fellow party-goer hurled a hat McGregor’s way, the two-weight UFC champion reacted by mocking the thrower, giving a sarcastic thumbs-up before stomping on the hat with his left foot. 

McGregor has a well-documented reputation when it comes to having a short fuse and angry outbursts: He has attacked a bus, smashed a phone and sucker-punched an elderly man in a pub. This go-around, though, he managed to restrain himself, only damaging the hat. 

McGregor has yet to return to the Octagon since suffering a gruesome leg injury last July in UFC 264. 

McGregor, who turned 34, celebrated his birthday in a private club at the Destino Pacha Resort in Ibiza.