From the Drain (4.5)

Movie · 1967 · 13 min · Horror, Comedy

The film is centered on two men in a bathtub; it is implied that they are veterans of some past conflict. The first man is paranoid about the drain of the tub, the second indifferent to it. As the conversation between the two men progresses, a vine-like tendril emerges from the drain…

Directed by: David Cronenberg

Starring Mort Ritts, Stefan Nosko

We don't know where to watch it in the US.