"A Very Sunny Christmas" (Season 6, Episode 13) is an hour-long It's Always Sunny in Philadelphia special, originally released in 2009, featuring the Gang ruining their childhood memories of the holiday. Key moments include Frank being sewn into a couch, Charlie's breakdown, a claymation sequence, and the group finding unity by throwing rocks at trains. Read a full episode breakdown at It's Always Sunny in Philadelphia Wiki . Review: A Very Sunny Christmas - Flixist