I can see it now...
Please allow me to re-post my comment to the Coca Cola Slurps Millions of MAC addresses thread (which is here: http://www.theregister.co.uk/2014/01/03/coca_cola_slurps_millions_of_mac_addresses/ )
I can see it now...
A camera on the vending machine will use face recognition matching your face with your facebook profile. Then it will say out loud "Hey Sarah! It's hot today, looks like you could use a coke!"
There'll be a picture of Sarah and her mates, (the picture having come from facebook) looking happy and carefree.
Sarah will say "Oh wow, that's so cool" and immediately start recording it with her Google glasses, and bleeting ^M ^M tweeting the fact that the Coke machine knew who she was. "It's so cool!".
She'll buy a coke. A cherry one. Because they're nice. She doesn't carry cash, because, you know, that's so, like, analogue, man. She only carries a credit card. She pays for the coke with her credit card.
The coke machine will say "Gee, thanks Sarah! You have a great day now!". It simultaneously updates her Facebook profile, posting a message on her wall (or whatever the fuck they're called) saying "Hi, I just bought a Cherry Coke at Edmontons on Vine Street and 3rd, 'cause Coke is IT!". It also simultaneously posts a "like" to the Coke corporation.
The purchase by credit card causes an automatic run of her ID against a known terrorist database. Her name is not on the database. She is not a terrorist.
However, it is noticed that she has an outstanding parking ticket from 6 months ago that she has not paid.
An alert is automatically routed to a patrol car in the area, along with her driving licence details, photograph, and pictures of her from her facebook account, for indentification purposes.
Since they have their phone ID, and she's in a Mall, it's relatively easy to track her location within the mall and the police officer spots her quite quickly. She's talking to some friends and tweeting furiously on her phone.
The officer approaches, and in a friendly manner (it's only a parking ticket, afterall, it's not like she's a terrorist or anything) says "Hi, Sarah, I'm Officer Jenkins from 3rd precint. I'm sorry to bother you, but I'm afraid I need to take you down-town to deal with an outstanding parki..."
Sarah hears "I need to take you downtown" and thinks "Shit! My parking ticket". Panic overtakes her. She runs for it.
Officer Jenkins stands for a moment in amazement, before giving chase. He shouts after her "Sarah! Stop! It's okay! It's just a parking ticket!".
An officer approaching from the other direction sees what's going on, and notes that the young woman is running towards him. Probably a theif - stolen someone's handbag or wallet. He draws his side-arm and shouts "Police! Stop!". He notices she has something in her hand. It might be a weapon. He fires one shot and hits Sarah in the chest. Sarah hits the ground.
Her iPhone smashes on the floor.
"Shit" says the officer.
Officer Jenkins arrives. "What the fuck man? What did you shoot her for? She's just a kid"
"I thought she had a weapon. She was running man. I told her to stop!"
"She's just a kid. Get an ambulance"
Officer Jenkins goes to help her while the other officer radios for an ambulance. And backup.
Sarah's friends arrive, and begin recording the incident with their smart phones, and uploading to facebook, YouTube, twitter et al. Hash tag #OMGSarahOwnedLOL.
Officer Jenkins kneels down next to Sarah. "Sarah, are you okay? Don't worry, we're gonna get you some help. You're gonna be fine."
"I... can't... breathe.... I... feel... cold...."
"It's okay Sarah, everything's gonna be fine. You hold on. You hear me? You hang in there. Sarah. Sarah!"
Sarah's eyes stare lifelessly into the void, as she draws her final breath.
"Oh no!" cries officer Jenkins. Tears welling up in his eyes, he begins mouth-to-mouth.
"Come on Sarah! Stay with me!"
How do we know this?
Because the entire incident was recorded, and uploaded by her Google glass.
Meanwhile, the dead girls' profile reads "I just bought a Cherry Coke at Edmonton's and 3rd, 'cause Coke is IT!".