So bad it's good. The 1953 Z-movie scifi classic "Robot Monster" (complete with the Automatic Billion Bubble Machine provided by NA Fischer Chemical Products, Inc). Has it all--shoestring budget, guy in a (homemade) gorilla suit, two sets and a bunch of outdoor shots, and REALLY bad dialogue and acting.
"We Ro-Mans obtain our strength from the planet Ro-Man, relayed from individual energizers."
"The psychotronic vibrations will smash the planet Earth out of the Universe!!!" (While Komodo dragons with fins glued to their backs to simulate dinosaurs fight.)
So bad it's bad: I use this movie in white elephant gift exchanges over Christmas. 1964's Santa Clause Conquers the Martians. Pia Zadora in her first acting role (she's 6). My favorite Rotten Tomatos comment:
The plot, such as it is, proves it is possible to insult the intelligence of a three-year-old.
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I got it in a W.E. exchange, with a note--"Bet you can't watch it twice." I couldn't.