TIL there is an episode of Supernatural in which the two main characters are sent to an alternate universe in which they play the actors that play their characters on Supernatural (themselves) who are in the middle of filming an episode of a TV show called Supernatural.

http://www.avclub.com/tvclub/supernatural-the-french-mistake-52323



Submitted December 28, 2014 at 11:10PM by SpacemanEverybody http://www.reddit.com/r/todayilearned/comments/2qmp25/til_there_is_an_episode_of_supernatural_in_which/