Co-workers who don't really know one another past work related things get locked in a supply room and can't get out until someone comes back the next morning to open the door and things get interesting.
Upscale holiday masquerade party where she's the daughter of the rich socialite attending even though she doesn't want to and he's a server. He notices based on body language alone how out of sorts she is there and attempts to bring a smile to her face. The chemistry works wonders in both of their favors.