What Sense is most likely to trigger a memory?

I had a friend who could smell something and that smell would trigger a memory – i.e. the smell of apple pie and she was “instantly” 7 yrs old again and back sitting in her grandmother’s kitchen watching her make pies for church. My sense tends to be music – I hear “Stairway to Heaven” and I remember that long slow dance at my 9th grade dance with my crush who is now one of my best friends. What about you? When do you get flashes of memory from something you taste/smell/touch/see/feel ?