As a cop, what's the creepiest thing you've investigated?
There was a string of residential burglaries by a suspect who we called "The Mudder". He would go into unoccupied houses, usually through a basement window and usually while the residents were on vacation, and trash the place by making piles of stuff in various rooms, taking ketchup, mustard and the like and pouring it on the piles, breaking the glass in photos and putting those on the piles and then, when possible, snaking a garden house into the window and leaving it on.
The suspect was never caught-it was thought it was a juvenile and the burglaries just stopped after a few months. One theory was that it was an emotionally disturbed area resident who subsequently moved away.
House burglaries were bad enough with people feeling defiled by having their possessions pawed over and strewn about, but these crime scenes were over the top in the mess, destruction and psychological trauma they caused...especially since they went unsolved.
A colleague of mine saw a car parked in a city park after hours. He approached it and saw it had one male driver. As he approached the guy he shined his flashlight in the car and saw the guy had a chicken in his lap. There were feathers floating in the air in the car. Upon further investigating he discovered the guy was having intercourse with the chicken!