Fresh off the finale of its 12-year Vertical Epic series, California’s Stone Brewing Co. has announced its first collaboration beer of 2013, and it is a fun one for fans of the TV show It's Always Sunny in Philadelphia.

Dayman Coffee IPA is a collaboration with Illinois-based Two Brothers Brewing Co. and Chicago-based Aleman, a brewing collective that first made the beer earlier in the year and won the 2012 Iron Brew homebrewing competition with it. Greg Koch of Stone was a judge at that competition, and so the partnership began.

Dayman is a recurring theme in Always Sunny. It's first mentioned in an episode called "Sweet Dee's Dating a Retarded Person." Charlie writes a song called "Nightman," which then turns into a collaborative song celebrating "Dayman," played by Dennis. The song is reprised in an episode called “The Nightman Cometh,” about an entire musical produced by Charlie to woo the ever-fickle Waitress, the woman of his dreams. As might be surmised, the gang mangles the play, which was fraught with absurdity to begin with.

If you haven’t seen the episodes, they are both worth a watch, especially if you can enjoy it with a nice coffee IPA. Here's a short clip with the song.