This page of movie posters from an alternate universe has been making the rounds on the strength of this poster alone.
But I say go there and see how hard it is to pick a favorite. This. So. Rocks.
Okay, okay, my faves (admittedly based on obscure name checking and/or none-too-subtle dislocations):
Andrei Tarkovsky's Micronauts, featuring James Brolin, Tom Selleck and the music of Wendy Carlos.
Ghostbusters, 1960s style, with Vincent Price, Christopher Lee, Peter Cushing, a demon possessed Bette Davis and the music of Henry Mancini.
The Star Wars with Malcolm McDowell, Jacqueline Bisset, Cheech and Chong (as the Droids), music by Bernard Herrmann, direction by Alejandro Jodorowsky, screenplay by Norman Mailer.