How about this one Judy. A very warm spring day so we only had the screen on our backdoor. Our dogs are supposed to be always supervised with company over and I went to the washroom hubby got distracted in the kitchen - our 6yr old male guest (whose parents were present and also distracted) the little boy decided to take Magic for a walk

Luckily for us he walked Magic out into our fully fenced in backyard. And it was in one sense cute to see as Magic is used to walking calmly with my hand on his back and the little one whose head did not even come close to the height of Magics head was standing with his whole arm over my beastie. But I about died when I saw them out there alone.
Mistakes with dogs do happen - but it surprises me that so few folks have any common sense whatsoever.