Brooks Barnes, in The New York Times, reporting on Disney rolling out wristbands equipped with radio frequency identification for access to rides and purchasing food and merchandise:
MagicBands can also be encoded with all sorts of personal details, allowing for more personalized interaction with Disney employees. Before, the employee playing Cinderella could say hello only in a general way. Now - if parents opt in - hidden sensors will read MagicBand data, providing information needed for a personalized greeting: "Hi, Angie," the character might say without prompting. "I understand it's your birthday."
Privacy issues and general creepiness aside, this is kind of awesome.