Minority Report, take 2?
"Hey, Mr Cruise, love the new eyes! We've got the perfect suit for you on sale, and there's a great new cocktail you're just gonna love!
"To get you in the 'Happy Hour' mood, we've lined up a few songs you like - "Gimme that ole time hokey religion", "You have Betty Davis' eyes", "A Mite at the Oprah" and the remake of the old Blondie classic, "Got your tagging from your telephone"...
On a slightly more useful note, all you need is for the "jukebox" to query every phone that comes through the door and copy the numbers to a widget at the fire evacuation point (and delete them when you leave, natch), and if there's a fire, it can give you a rough idea of who should be there and whose about to become part of the menu...
And there'd be no more searching for your mates through the dim smoky atmosphere, either - the 'box would announce your arrival, so the gits could sneak out the back as soon as it announces your entrance...