In the scene early in the episode where Kevin approaches Winnie at her locker, she leaves her locker without closing it, but somehow it's closed.
Narrator: They say you can live a lifetime and never find love. So I guess I was lucky. Because true love crossed my path the first time I met the girl next door - Winnie Cooper. Winnie and I'd been together longer than any couple I knew. Still, history only goes so far. Kinda like Winnie. Unfortunately, the mathematics of the situation were open to interpretation. To me, they led forward, to that great unknown. But to Winnie, they led... back! See, the great thing about us was that we had this past together. The bad thing about us was that we had this past together. Not that I minded being part of Winnie's past. It's just, when it came to who I was... she seemed to regard me as a known quantity.
Narrator: They say hindsight's twenty-twenty, and I guess it's true. Because as I stood outside Winnie's house that night, I suddenly saw it all so clearly. I'd sold both of us short, by taking something that most people never have and throwing it away for something less. I'd been in such a hurry to impress people, I'd torn apart the only ones who did...us.
"Wake Up Little Susie" by The Everly Brothers