People are more like dogs than you might think. Generally speaking, the sense of smell for a dog is the primary means of communication and identification whereas visual clues tend to be more important for people. This doesn't mean that we humans are completely inept in the smell department.
I contend that there are two smells that we know automatically. They are inherent in our nature....sort of a "Platonic Smell" type of thing. Those two smells are:
1. Stripper smell
2. Fat lady perfume.
Tell me I'm wrong. Just try.
I was standing in the elevator bank this morning in my building and I smelled fat lady perfume. Did I see her? No. Am I 100% sure the smell came from a fat lady? Hell yes.