I was at my cousins house once whan I was little, and their house always smelled funny (there were 9 kids, so this fact is not surprising). This one time I went there, and it was the worst smell you could imagine. It turned out that a hamster had got loose and then died in some heating vent. When the heat came on, the smell was wafted throughout the entire house.
I am at work, and it smells really bad. Except, instead of a hamster, it smells like someone took a dump in the register.
I am not a happy camper right now.