I've seen this happen at film premieres when "fans" beckon over the stars and take their photos or ask the star to take a photo of them etc with their camera phone.
When they were showing Big Ears and horse face touring the riot sites earlier this was happening to them . How bloody rude that as soon as one of them starts to walk towards the public to chat to them, that they pull out their phone and film them as they talk to them. I was willing one of them to grab the phone and pitch it in the wreckage behind them