MID Radio grounded on the dash??

[Bmwtvboy]

This is bizarre. I was trying to test for a draw. I thought the radio was dead when I put it in the dash space. NO power at all ; until I snapped it back into
place. Then it came on, the screen flickered awhile and finally the broken up LED showed radio info. I didn't know the radio was grounded on the metal tabs in the dash opening. That's strange ? NO?