I don't have the horror of being constantly scared of glass falling from overhead like some of you mummies! As a daddy, my first reaction would be one of shock and disbelief if it happened to me or my kid.
My little one is still young, so I've mainly focused on the usual safety issues like strangers, traffic, and general hazard awareness. But this incident is indeed a good reminder of all the random stuff that could fall from above -- haven't really considered those! Time to have another serious talk with the missus