I used to keep some raw meet in my mini-fridge's freezer in my old apartment. One time I left for the holidays and unplugged my fridge so it wouldn't use electricity. My fridge was empty, but needless to say I forgot about all my meat in the freezer (I rarely cooked anymore because my girlfriend did it most of the time). When I got back to my apartment about a month later, I left my fridge unplugged for a while because I'd moved all my food into our common fridge and decided to just use that. So my raw meet was left sitting in the freezer (which, though it wasn't working, still hid the growing smell).
At some point I plugged the fridge in again for some reason (I think to store beer). Anyway, when the time came to move out I opened the freezer to find the frozen carcasses of maggots and flies all over the fucking place, and realized I'd forgotton about the meat.
I had to clean out that fucking freezer, and it was the worst thing I've ever smelled. At one point I tried to pull out one of the wrapped packages of meat, and the plastic just melted in my hand. After washing like five times I could still smell it on my fingers.