Just from the danger of a mower throwing things across the yard, is enough for me to never mow when anyone is around.
I drove past a farm house a couple years ago where the guy was mowing the lawn with a child in a little red wagon being pulled behind the mower, while mowing. I had to go back and confront the guy. He didn't like being told, but I couldn't resist. If he continued after knowing what could puncture his child, I at least figure he was fully aware of it.
But I often see mowers going with children playing in the same yard within a few feet of the mowers, as well as adults doing things in the yard or a neighbors yard (while mowing). Hard to understand.
Sorry, don't mean to preach, or impune anyone. Just something to be aware of when mowing. I think we all know of the dangers, and the risks. But then, people still smoke too. /forums/images/graemlins/crazy.gif And that is their choice, as I see it.