Glenn Howerton Explains Why He Almost Quit 'It's Always Sunny in Philadelphia'

Glenn Howerton admits he seriously considered walking away from It’s Always Sunny in Philadelphia. Earlier this week, the 49-year-old actor and co-creator joined co-stars Rob Mac, Kaitlin Olson, Charlie Day, and Danny DeVito on a panel to celebrate the show’s 20th anniversary. During the panel, Glenn explained why he almost quit as they began production