Weird one that happened to my sister a couple years ago.
Background info: she and her (now) husband are house sitting for my brother in laws uncle. The uncle is old and starting to lose it. He rents out a basement suite and a nice lady lives downstairs. She cleans the house when she is there but he wanted my brother in law to come check on things and feed his old cat once in a while.
Okay so first day they go to house sit they get in but can't find the cat to make sure it's okay. My sister has cats and know they like to hide when they are dying so they are all worried and are looking everywhere for this cat. In all rooms under the beds and everything. Even check with the lady downstairs, she hasn't seen it. So my sister opens up the closet in the spare bedroom and is looking around stuff on the floor. Moves a couple of things and sees a set of feet on the ground in the closet, with clothes blocking anything above the feet. The feet have nicely painted toenails and look human, but she assumes it is a doll or something. They look in a few more places and all of the sudden the cat is in the middle of the living room just hanging out. So they lock the deadbolt and leave.
Sister and her boyfriend go out for dinner and a movie and she can't stop thinking about the feet and how real they looked. My sister had started dating her bf fairly recently and didn't want to seem crazy so she didn't bring it up but a few hours into the night she decided she needed to tell him. He decides that it's probably a doll but he offers to go back and check anyway. When they arrive my sister will only stay on the patio because she is scared, which makes him realize that this must be something serious. They go to get in the door, but the deadbolt is now unlocked and the handle is locked. Now he thinks there must be someone in there. At the door there is a fireplace so once he is in there he grabs the sharp poker stick from the fireplace tools and starts to sneak towards the closet. He opens the closet and sees the same set of feet with painted toenails on the floor. He pokes it lightly with the fire stick and the toes scrunch up. He proceeds to smack the foot as hard as he can with the sharp stick and yells "Get out of there!" Out comes a lady in her mid-30s, holding the cat and a can of coke.
Turns out she was friends with the basement tenant. When she became homeless the friend let her stay with her until she found out she was addicted to crack. Started leaving drugs around the house and had shady people coming into the house so she kicked her out. Somehow she got a key to upstairs and had been staying there while the uncle was gone. Police were called and she was arrested.
TL;DR crackhead in the closet