I was 4 years old, sitting on my babysitter's screened-in concrete patio....she'd given me a house key to play with, so I decided to play "car". To do so, I faced the stucco wall with my feet on either side of an electrical outlet (to use as the ignition). I plugged the key the babysitter gave me into one side of the socket........and got knocked across the room. I can tell you that I never played "car" again!
I guess that grounding of outlets wasn't a priority in 1963.......