The Brain That Wouldn't Die (Completed in 1959, released in 1962)
Re-watched this low-budget sci-fi/horror flick recently. Mad doctor/scientist keeps his fiancée's head alive after both of them are involved in a fiery car accident that decapitates her. He decides to acquire a fresh female body to attach to her head, and starts to look for potential replacements in a burlesque bar and on the street. His fiancée, angry that he won't let her die, begins to plot her revenge by communicating with a mutant the doctor keeps locked in a room in his basement laboratory.
Classic low-budget weirdness!