Also, if you're in a concert hall, for pity's sake
turn off your cell phone!! If you are expecting an emergency call, set your phone to vibrate and step out if it rings, or tell the person who might be calling you to call the concert hall instead and have an usher fetch you.
A few months back, I was at Lincoln Center enjoying a concert when someone's cell phone rang mid-concerto.
This was despite the slide projected before the performance, informing the audience that cell phones and pagers should be turned off. (I will not even comment on the number of people who seemed to think jeans and t-shirts were appropriate concert-going attire.
)
There was an ad (I think it ran last year?) set in an opera house, where someone's cell phone rang mid-aria (not to mention off-key to the aria), and the soprano picked up a spear and hurled it through the guy's cell.
