When I lived in communal accommodation for a while, I came back a little bit shabby one evening and put my kebab on the radiator outside the room whilst I fumbled with my room keys. It slipped behind the radiator, and being wrecked I couldn't be arsed retrieving it. In the morning, the corridor absolutely stank of kebab, and being hung over, I forgot about it and went to work.
Fast forward 8 years, and I had reason to be back in the same accommodation, and remembering the incident I decided to check behind the radiator, and to my surprise/horror it was still there. 8-year-old dried up Donner Kebab is not pleasant in the slightest.