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Chanel No. 5 - The only scent my mother ever wore when I was a kid.

Diesel exhaust (the old stuff, not the new ULSD fuel) - My father was a Greyhound bus driver. Getting to ride on the bus, alone with him, between the station and the shop was a real treat. The overwhelming smell of the shop was that of those buses running.

There are others, but those are the top two.