I got a friend who had first time tryout of automatic. Imagine this scenario:
Gearshift in "D" and pedal to the metal, after few seconds of acceleration he forget he is in automatic vehicle and tryed to push the nonegsisting clutch pedal for gear change....It was the brake pedal! He almost felt out of seat, banging against the wheel and loosed control above his cousins BMW...
Nobody was heart, car went undamaged unlike his pride - Pride was pretty much damaged!
I myself never have drive an automatic, but I may do the same stupidity just because of automatic reflexes we all develop during years.