Always.
And what do you know.
It's the boy/girl you failed to notice. It's always him/her: the person you sit next to at lunch but never actually have lunch with. With the added benefit of retrospect--though not necessarily experience--you vow to make Thursday lunches and Sunday breakfasts-in-bed a continuous film in technicolor. Verdant green and luxurious blueberry imaginings-turned-madeformovie snapshots. It's a holy montage all right, but the material's old so bear with the jumps and reruns.
Before you call for a recount, there are various books and now, blogs that have detailed this story. We can easily let this one go.
It's always that boy, and/or always that girl.