Was at my pal's apartment this weekend. He rents. His oven/stovetop is one of the small rental sized jobs. It's plugged into an outlet attached to the adjacent cupboard.
Meant to grab a pic - but the grounded three prong plug is connected to the two prong receptacle with an adaptor! And of course, it was installed upside down so it was not screwed onto the rec to establish a ground with the BX and metal box.
If I could only remember to THINK about what I was doing before I did it.