1979's Island of the Fishmen was purchased by Roger Corman and re-released as 1981's Screamers. The trailer promised that you will see a man turned inside out. Needless to say, the ads (initially, at least) promised more than they could deliver. This trailer was put together by B-movie veteran Jim Wynorski at the beginning of his career.

Funny thing is that this trailer would make a decent movie, with its goopy, gruesome makeup by Rob Bottin (no, seriously) and its urgent music (I have no idea who did it - part of me wants to say Wynorski compatriot Chuck Cirino - but it's good stuff). Would be interested in hearing more about it.