The motion-sensor lights on the staircase randomly flicker, which is later revealed to be Morse code.

Film/Series: Parasite

Category: Foreshadowing

Timestamp: 00:23:40

Early in the film, the wealthy Park family casually mentions that their staircase lights seem to glitch and flicker on their own. It is later revealed that the man living secretly in the basement is manually triggering the lights to send Morse code messages to the outside world. The flickering is a subtle, early indicator of the terrifying secret hidden underground.

The motion-sensor lights on the staircase randomly flicker, which is later revealed to be Morse code. in Parasite

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