Probably about 5 years back, my dad's big freezer in the basement somehow got unplugged and no one found out for maybe a week or two. Well, there was pounds upon pounds of frozen beef in there, and we finally figured it out when researching the strange but faint smell in the basement. We had to haul that meat out of there in trash bags, it was by far the worst smell I've ever smelled. I figured "hey, no smell can be THAT bad that it would literally make you puke", but HAH! I was so close to hurling the entire time, AND I had a towel over my face. It was awful. Amazing how bad rotting flesh smells. Anyways, it was summer, so the freezer spent a little while outside soaking in bleach and whatnot, and it eventually was as good as new.