Landlords cleaning
I am pretty sure my landlords are lonely, or extremely nosy, or both. They came over to localize and remove a mysterious smell (turned out to be a dead mouse in a cockroach trap. I have no idea why it crawled into one.), and decided to clean behind the stove and fridge and stay for a while and fix other things... Weird situation. Can't really be too blunt and just tell them to leave either.
