My wife has a food processor, bought a few weeks ago, powered directly from the A.C. mains, i.e. not via a "wall wart" power supply, and, after it has been switched off at the wall and fully unplugged, she experiences a slight, but significant shock -- more than a tingle, if she touches the pins on the plug as she packs it away.
Please, how does this happen? It seems almost as though a capacitor has remained charged, but I do not understand how this can occur on the A.C. input pins. Also, is it a fault with the appliance that means we should return it to the retailer as dangerous?
Following up from the accepted answer, thank you, could I or should I, and I know enough to do this safely, connect a high ohms value resistor across the line to neutral to discharge the capacitor?