If you’ve been keeping up with the current season of the hit sitcom ‘It’s Always Sunny in Philadelphia’ you may have noticed a few familiar faces from the UFC.

In the fourth episode titled ‘Wolf Cola: A Public Relationships Nightmare’, Mac and Charlie discover that their product ‘Fight Milk’ (which is described as the “the first alcoholic, dairy-based protein drink for bodyguards by bodyguards”) is being used by UFC fighters Paul Felder and Donald Cerrone in a gruesome fashion to help make their weight limits. Additionally UFC featherweight Cub Swanson and UFC president Dana White make appearances in the episode as well.

In the following behind the scenes vlog, Donald Cerrone shares his experience filming with the show and finds out what goes on in Paddy’s Pub between filming.

Throughout the blog ‘Cowboy’ meets Danny Devito (who surprisingly knows his early UFC history), finds out what the alcohol on set is actually made of and then pretends to kick Kaitlin Olson (who plays Dee) right in the face.

Check it all out below.

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It’s Always Sunny in Philadelphiais an American television sitcom that premiered on FX on August 4, 2005. It moved to FXX beginning with the ninth season, and has remained there since. It was created by Rob McElhenney, who developed it with Glenn Howerton. It is executive produced and primarily written by McElhenney, Howerton, and Charlie Day, all of whom star alongside Kaitlin Olson and Danny DeVito. The series follows the exploits of “The Gang”, a group of self-centered friends who run the Irish bar Paddy’s Pub in South Philadelphia.[Source: Wiki]

Donald Cerrone(born March 29, 1983) is an American professional mixed martial artist and former professional kickboxer currently competing in the UFC’s Lightweight and Welterweight divisions. He is also known as the “busiest” fighter in the UFC, due to consistently having at least four fights per year since 2013.[Source:Wiki]