My anecdotal experience: I’ve never noticed this with my 2014 MBP until I was at my parents’ recently, plugged into an extension cord from their garage. With m

My anecdotal experience: I’ve never noticed this with my 2014 MBP until I was at my parents’ recently, plugged into an extension cord from their garage. With my feet on the ground, the metal body of my MacBook was “tingly” all over. Feet off the ground, no more tingling. I’d love to better understand what was going on (and whether it’s potentially dangerous). FWIW, I was using the Mac power cord with the ground pin. Does this just mean that the wiring in their garage isn’t properly grounded?