It’s the kind of thing that might turn up on MN as an example of woo, but the explanation is very funny.
Woman scared by mystery doorbell ringer late at night, turns out it is a slug crawling over the button. The video footage is amazing.
metro.co.uk/2021/10/08/mystery-creeper-ringing-womans-doorbell-late-at-night-turns-out-to-be-a-slug-15388799/