The Insider.com

On October 11th at midnight, a show will air called Greatest Event In Television History (a.k.a. GEITH) on Adult Swim, and still, the only real clues we have as to the plot are that Jon Hamm wears a cowboy hat and Adam Scott dons a tuxedo.

• October 04, 2012Action Figures Engage in 'Battle of the Bonds'
• October 04, 2012Ethan Hawke: I'd Eat Angelina Jolie
• October 03, 2012Olivia Wilde Confirms Dating History (Sorta)
• October 03, 2012Taylor Explains Her Signature 'Shocked Face'
• October 03, 2012The Movie Alison Brie Would Like to Erase
• October 02, 2012'South Park' Spoofs Honey Boo Boo

The Parks and Recreation star has been promoting the special via Twitter by leaking a few on-set pics, but nothing that lets you know the premise of the comedy. Today, Scott posted a photo of him and the Mad Men mustachioed Hamm, tweeting: "We apologize in advance. The Greatest Event in Television History Oct 11 midnight Adult Swim #GEITH."

"Now this show is so secret, I'm not allowed to tell you anything about it," Scott says in the show's promo.

We don't know what to expect but we love the idea of Hamm and Scott on the same show. Will you be watching?