Quote from Jackie in The Promise Ring
Donna: Can you believe it? Isn't it pretty? Jackie: Yeah. I really need to introduce you to my good friend nail polish. And a promise ring is sacred, Donna. Why aren't you wearing it on your left ring finger? Donna: I don't know. 'Cause I like it on this finger. What's the difference? Jackie: Donna, if you don't wear your promise ring on your left ring finger, it totally cancels out the promise that you will be together forever. Donna: Wait. That's what I promised?