Context in Perception of Scents

I noticed something interesting just now. How you perceive a scent depends heavily on where you believe the smell is coming from. Someone sat down next to me, and I thought he smelled like a dead animal. This was quite disconcerting. Shortly thereafter, I looked over and saw that he was eating a turkey sandwich. Immediately, the odor of a dead animal was gone, and the smell of a turkey sandwich was present.

I think it is interesting how the brain interprets the same odor differently depending on where it believes it originated. I would imagine this is somewhat similar/related to how taste is heavily dependent on smell; you can't really taste anything if you have a cold or a stuffy nose.