With one of my jobs I work concession for a movie theater part time,
"the ticket sales man" or "the food salesman"
I almost always have good lookin sets come in and buy crap to see whatever.
I think its possible to build up curiosity to isolate them, or one of them, to come out during a movie and see me.
Im thinking use:
me:you two must be best friends,
hbs: huh?
me: you both have the same facial expressions
(they look at each other and laugh)
me: i like that, and well, the other thing i like I cant really tell you guys.. or youll stop doin it!

hbs:omg what is it!
me:come out when the movie gets boring and ill tell ya
i have a short window, but i think this could work!?
any thoughts on other ways to go about doing this?