During the weigh-in yesterday, McGregor only wore boxers and afterward, when the two fighters squared each other up in their final face-to-face photo up, he seemed to, um, be rather aroused.

Social media pointed out while watching the weigh-in that Conor had a boner. Let’s just say people started clowning.

“Mayweather laughing at Mcgregor at weigh in because Mcgregor had a boner? That's pretty hilarious,” someone tweeted. People just paid to see Conor mcgregor sporting a murder boner during weigh in,” another wrote.

Conor McGregor takes on Floyd Mayweather at 9 pm EST tonight in Las Vegas. The match is available on PPV through Showtime.

Check out video of the face-to-face and the reaction to Connor’s arousal below.