From http://www.dreadcentral.com/human-centipdede-first-sequence : Finally! The Trailer for The Human Centipede (First Sequence)

You've read the reviews. You've seen the concept art. You've been horrified by the stills. You loved the one-sheet. Now the moment you've been waiting for ... the trailer debut for the little flick that's given new meaning to the term "ass to mouth" -- Tom Six's The Human Centipede (First Sequence)!