I'm going to assume that it's someone you already know and you have gotten past the Name, facebook/myspace/tribe and phone number phases, because let's face it when was the last time you met someone that didn't know someone you know...No I introduced you to them remember?
Anyway you look them in the eye and say Do you:
Want to go see a cheap movie where they serve pizza and beer?
Go to a performance art/pub crawl in a pirate/santa/etc costume?
Have sex in my friends closet while the rest of the party is otherwise occupied?

To which they reply:
No:
you're my best friend's lover or my best lover's friend
we did already...remember?
We have the same hairstylist
...and that would just be too awkward


Do you ever feel like that?