man and woman in a multistorey building, which is old, from 1970s, were terrified last night when the doorbell kept ringing after "hours of silence" at 21:00 onwards
soon some neighbors complained about the same, their bells were ringing too
doorbell is outside the apartment complex next to the main door and guests can find a list of names there to press the correct button
https://www.is.fi/ulkomaat/art-2000011481530.html
the neighborhood called the police who checked up the premises and tried to find unwelcomed guests around the building complex immediate area
nobody was even near it
finally someone actually checked the doorbell system: there was a snail in it!
snail had left a trail of slime over the buttons, slime short circuited the whole button box and it kept randomly ringing people
electrician came there (because only he has the permits) opened the box with a screwdriver, wiped out slime and everything worked again
of course the snail was also carried some 80 meters away from the building to the nearest green bushes