Flavorpill has a list of the The 10 Most Unconventional Movie Trailers of the Past Decade and this is their bonus trailer. Watch it through the end, it really captures the spirit of trailers.
Didn't think all of the trailers were that unconventional, but some of them really did the trick. I'm still trying to figure out if the Cloverfield trailer was better then the actual movie. And what's up with that sequel? Take a look at all of them and decide for yourself, but you'll get a good chuckle out of this one.
Flavorwire » The 10 Most Unconventional Movie Trailers of the Past Decade.