Charlie Day, one of the stars of It's Always Sunny in Philadelphia (and Horrible Bosses and The Lego Movie), was a lot of fun to interview. For Backstage, we chatted about his long-running show, how he gets "into character" to play Charlie Kelly, and why he's still doing the sitcom after 10 years (with more years to go). That's just part of our conversation -- I had a blast with this one. Hope you enjoy.
