The original Little Shop of Horrors directed by the low budget horror schlockmeister himself, Roger Corman, and one of the first feature film appearances of Jack Nicholson.
The Little Shop of Horrors (1960)
https://www.youtube.com/watch?v=BnnTgacQo7w - from the Vintage JukeBox - Don’t Stop The Music YouTube channel (1 hour 44 mins long - 1080p)
Synopsis:
A clumsy young man nurtures a plant and discovers that it’s carnivorous, forcing him to kill to feed it.
Directed by Roger Corman.
Cast: Jonathan Haze, Jackie Joseph, Mel Welles & Jack Nicholson.
Trivia:
The film was shot on a budget of $28,000 (about $240,000 in 2019), with interiors being shot in two days utilizing sets that had been left standing from A Bucket of Blood (1959).