As an apartment dweller on the top floor of a triplex, I have no upstairs neighbours, only an unfinished attic above me. Since outdoor temperatures started dropping with the arrival of Winter, I've had a few uninvited houseguests making a ruckus up there.
After a few (unsuccessful) attempts to look around with flashlights to see what was up there, my landlord and I eventually set a trap with some almonds and peanut butter.
Today we caught ourselves our first attic-dwelling squirrel! I know what I'm eating for dinner*!
*: Actually the squirrel is being driven away from the house and gently released into a park.