I had a friend whose block heater shorted out while the car was in his garage. He was alerted by a smoke detector, went out in his PJ's, opened the garage door

I had a friend whose block heater shorted out while the car was in his garage. He was alerted by a smoke detector, went out in his PJ's, opened the garage door, and pushed the car outside, whereupon it burst into a pillar of flame. He noticed significant tingling in his feet while pushing the car out. This was in the days before GFCIs. He's lucky he wasn't electrocuted.