(Not sure if this is a valid UXSE question. Please let me know/change to correct format if needed)
I am looking for examples of UI failures/horrors of electronic point-of-sale systems.
I am working on a POS system and would like some good examples, preferably video but still images would be ok too.
From a uni lecture a few months ago, the best I saw was someone who had drawn, with sharpie marker on particular bookings. When asked why they did it, the person said "well they were finished and had paid the bill".