The next door neighbor's son absolutely didn't intend to do it, unfortunately you have pretty much predicted it to happen at some point, closely similarly to it is doing in the movies or on TV - a baseball heads on the loose in an afternoon of batting exercise and dashes straight into an upstairs display.
Or even an impromptu event hosted by your young son gets just a little rowdy and certain drunk party guests was able to run into the glass sliding window leading out to the pond area, doing what must have been an amazing shower of broken glass.
