Now if the vending machine were to deliver an electric charge sufficient to be classed as a shock, or injure the buyer sufficiently so that they didn't die outr

Now if the vending machine were to deliver an electric charge sufficient to be classed as a shock, or injure the buyer sufficiently so that they didn't die outright, but instead went into shock, then I think it could be classed as art which shocks. However, it would obviously also be classed as either dangerous or illegal (depending on which one you got).