Agora - Spanish Teaser set in Ancient Egypt
http://www.youtube.com/watch?v=W7PcjZCEwFQ
The Colonel - Hilarious fake trailer with Mel Gibson as Col. Sanders
http://www.youtube.com/watch?v=WCOp3YwsbZM
S. Darko - trailer for the sequel to Donnie Darko [not real sure how I feel about this one]
http://www.youtube.com/watch?v=CdyPngBH6mM