My Nextdoor devolved into multiple houses on my street setting up a shared Nest/Google account and rigging up a dozen or so cameras to watch their entire stretch of the street 24/7. All this because someone thought their car was vandalised (turns out it was vandalised in the parking lot of a mall ~10km away).

For context we live in a somewhat isolated, well off suburb, that according to police data has had a grant total of 63 crimes committed in it during the last 12 months, 41 of which were just people vandalising the same abandoned building.