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I love self checkout though because when you do find a glitched item that wasn't put into the system properly, you can royally fuck the store over.
On top of the free mexican food item, I also discovered there were these chocolate covered gummies that also rang up as $0.00 because of some glitch with their rewards card. They normally cost $2.00 but were $2.00 of with the card, so I cleaned out their entire supply. I must have ate at least $200-$300 worth of chocolate covered gummies over the course of several months before they finally fixed that glitch.
I also found a way to stop triggering the unexpected item error, you just tell them you brought your own bag and it disabled the weight checking.