It is impossible for my eyes and ears to be all places all of the time.
Luckily, I never find evidence of my kids doing anything dangerous.
PS. When I was a little girl, we used to push our trampoline (springs fully exposed, and no protective fence netting of course) up against the house, climb out our upstairs bedroom window and jump off the roof onto the trampoline.
This stuff my kids are pulling? Child's play.