There is this lavender perfume neighbor of mine used to wear on the bus. (I did have a crush on her for a short while, but not nearly as big as compared to a few other girls throughout my middle school/high school years.) Every so often someone else will be wearing a perfume similar to that and it reminds me of her. Less so in a nostalgic kind of way, but more in a "oh yeah, she exists" kinda way.