800
'Facial recognition' error message on vending machine sparks concern at University of Waterloo
(kitchener.ctvnews.ca)
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much thanks to @gary_host_laptop for the logo design :)
I bet it's from people picking at it and the paint chipping off the sharp edge, but it does also look like the hole was drilled on a Friday afternoon by a guy who probably should have retired 10 years ago.
I think it’s remnants of chewing gum the students were putting in there.