All Neat in Black Stockings (1968)
Directed by Christopher Morahan
Film Nationality - UK
Poster Nationality - USA
I have no idea what this movie is - and why it's lead actor has no belly button! - and it's IMDb rating of 4.6 doesn't exactly fill me with anticipation when even complete dirge can get above 5.0. But, for me, I love this poster for one big giant major reason:
EXCITEMENT OF SHARING
Perhaps my favourite poster tagline outside the horror genre (that genre is filled with genius taglines). It's just so enticing and attention-grabbing.
Still, I would like to know why that man has no belly button!