Back in the days before seatbelt laws and car seats for kids, 1968, my younger brother fell out of our family car. My parents let him stand on the back seat in the middle. Unknown to us at the time we had a sticky door latch, the door looked closed but it wasn't latched. My brother survived with a few scrapes and bruises and from then on had to sit down in the car.

Now to modern times, the other day (and I see this regularly) I saw a kid about age 6 or 7 standing in the front floorboard of the car he was riding in. The driver, I assume it was his father, was ducking in and out of Christmas shopper traffic here in the metro Atlanta area. Stupid, stupid, stupid.........

I don't even pull my car out of park until everyone is belted in their seats!!!

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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)