Mystery vs. History

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article's lead section may be too short to adequately summarize the key points. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. (December 2015) This article's plot summary may be too long or excessively detailed. Please help improve it by removing unnecessary details and making it more concise. (December 2015) (Learn how and when to remove this message) (Learn how and when to remove this message)

"Mystery vs. History" is the sixth episode of the seventh season of the CBS sitcom How I Met Your Mother and the 142nd episode overall. It aired on October 17, 2011.^[1]