Been bitten ( literally in some cases) by those ungrounded supplies, even on equipment that had a 3 pin mains lead. Turns out the manufacturer decided that the 3 pin socket was cheap, so used it, and then made the mains lead cheaper, even though the wire inside was barely conductive, and could possibly once have contained copper, by omitting the PE conductor, leaving the plated steel pins in and the plated steel contacts in the moulded socket as well.