At the supermarket I scanned my loyalty card whilst the operator was in a menu and that was a fun mess for them to sort out.

I didn’t pursue it further. Usually I just scan a single beer and shoulder surf the supervisor PIN.
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RT @jpdanner@twitter.com
Each of these modes can be configured via... Barcodes!

You can see how this would go wrong...

#Kawaiicon #KawaiiconNZ
https://twitter.com/jpdanner/status/1184996137066885120

Set your phone’s name to “%x%x” and see what name it shows up as on your car’s head unit.
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RT @jpdanner@twitter.com
Easiest attack vector is via Bluetooth in the head unit

#Kawaiicon
https://twitter.com/jpdanner/status/1184575749765791744