Invasion of the Saucer-Men, 1957, USA DIRECTED BY EDWARD L. CAHN
This is hard to find on DVD in the UK and US, only currently available as an Australian release. It's one of my favourite 50s drive-ins, a B-movie comedy aimed at teens that used real teenage actors as opposed to adults trying to recapture their lost youth (the most familiar face is a 19 year-old Frank Gorshin, who later played the Riddler in Batman). It was released as a pair with I Was a Teenage Werewolf with the tag line "We DARE You To See The Most Amazing Pictures Of Our Time!", and the most persistent rumour about this film is that the script, a serious one derived from a Paul Fairman short story, had to be re-written when producer Samuel Z. Arkoff took one look at the aliens and knew they couldn't work as anything but comedy. Alien invasions rarely come more ridiculously plotted than this, with the first killed under the wheels of a car on Lover's Lane and the entire force ultimately repelled by nothing more than car headlights. It also has some classy cinematography with some beautifully sinister use of light and shadow; another prominent contributor was Paul Blaisdell who created the Saucer-Men, and who later excelled himself with even more bizarre creations for It Conquered the World and The Beast With A Million Eyes.