If you've never seen FX's original series "It's Always Sunny in Philadelphia," you should be ashamed of yourself and go pick up the first four season on DVD immediately. (The comedy series follows the adventures of "the gang," five self-centered, horrible but hilarious people who own a bar in Philly.  They have terrible ideas and do terrible things to each other to others around them, much to our amusement.)

If you do watch "Always Sunny," then rejoice! Season 5 kicks off on Thursday, September 17, at 10 p.m. EST, and to celebrate, the cast is taking their production of "The Nightman Cometh" on the road.

Season 4 ended with Charlie (Charlie Day) writing a musical and casting the rest of the gang in lead roles. The entire cast takes the show on the road for a five-date mini-tour kicking off September 15 in Boston. Wanna try and catch a show? Heres' the tour's complete lineup:

9/15/2009 -  House of Blues Boston (Boston, MA)                     
9/17/2009 -  Tower Theater (Upper Darby, PA)
9/22/2009 -  Moore Theater (Seattle, WA)
9/24/2009 -  Nob Hill Masonic Theater(San Francisco, CA)
9/25/2009 -  Hollywood Palladium (Los Angeles, CA)

To see what's in store for the new season, check out the teaser trailer below...