The Help Vending Machine video shown below details a vending machine that you just don't mess with. Refreshing beverages? Oh, yes. And a siren. And a video camera. And a built-in emergency phone with a direct line to the police.
The security camera is watching you even if you just walk by; is it trying to protect customers or is it trying to pick some kind of an Orwellian fight?
I think that if you want a vending machine with attitude, you should model it on the Lucky Dragon ATM from William Gibson's 1999 novel All Tomorrow's Parties.
"Identify yourself, please." Lucky Dragon ATMs all had this same voice, a weird, uptight, strangled little castrato voice … probably kept people from standing around, [talking] with it… If you seriously tried to dick with one, drive a crowbar into the money slot, say, the thing would mist you and itself down with water and then electrify itself.
Tortoise Mobile Smart Stores
'... all round the city dozens of cars have rented out their trunks, which contain cigars and scotch and stuff.' - Karl Schroeder, 2019.
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'If Anyone Is Watching Earth...'
'Our study of your race has convinced us that you are not fitted to leave your planet in the present state of your civilization.'