I was renting a house once and I was a great tenant. No parties, kept the house and garden tidy, didn't cause any hassle to my neighbours. My landlord and estate agent were shit, wouldn't repair anything; leaks, electric going out etc. When I came to move out they told me I wouldn't be getting my deposit back because of x y and z reason.
So I took a massive shit on a plastic bag and hid it under the floorboards.
I've no idea why. I have never before or since done anything like it. I was young and thought it was funny at the time