To Kim C and Mrrzy (re People with impending emergencies): Sorry, Mrrzy, but I have to agree with Kim on this one. One can't expect a doctor on call, a pregnant woman's Lamaze partner, or a chronically ill child's parent to give up activities such as attending a theater performance or movie screening, when such activities can provide much-needed distraction from stress. But you - we all - CAN and SHOULD expect such people to switch their cell phones to "vibrate" (and to learn how to do it, if they don't already know!) and to make sure they answer their phones in a location where they won't be a distraction to others. If one needs to answer one's calls immediately, then one should sit next to an exit so he won't be trodding on other people's feet on his way out of his front-row-center seat!