Is that cup supposed to be special? Usually when doing the "object breaks to foretell disaster" angle, it is done with something of personal value, not a random object likely from a supply closest.
I'm starting to consider it funny though, if this piss poor attempt at raising the tension is the best the author can do, they've had done a better job keeping that shot angle, and just leaving the poor cup alone. Sort of like, it is funny how meaningless the attempt is.