Are there scents that trigger particularly strong mental/visceral associations for you? Maister mentioned a particular woman's perfume. I can relate to that as well with one that invariably reminds me of a high school sweetheart but the strongest one for me is the smell of machine oil. My dad was a machinist and always smelled like that when he came home from work. I'm long gone from living at home and he passed away 15 years ago but that scent will still bring back memories.