Well, quiet apart from the too close for comfort table next to me:
He: Gosh you make me smile. (I mean really? Who uses "Gosh" in real life?!)
She: I know. I see it when we're together.
He: Do you think others around the office see it?
She: They have no idea.
He: That's so cool.
She: I love the way it feels like we're doing something wrong behind a teacher's back.
He: See, you just keep getting more and more attractive. I feel like that too. You're too beautiful.
She: (Slightly gushing) My current boyfriend would never tell me that.
He: Rubbish. How could he not?!
It gets even more Mills & Boon from this point on, so I'll just leave the rest of that conversation right there.