Each spring the first whiff of lavender unfailingly zooms me back to my first boyfriend, now 56 years ago. He was never a 'serious' boyfriend- I didn't even like him all that much - but the lilacs were blooming the first time I went out with him.
Some years back I bought Pepsodent tooth paate. The first time I used it, nostalgia overwhelmed me- it is most certainly what I and my family used when I was little. Although in those days it was tooth powder.