What a pane

A rather large pane of glass - one of our reception windows - shattered today. The correct health & safety procedures were adhered too as the local area was cornered off, a risk assessment carried out and the office version of Autoglass was called. I still can't quite work out how it shattered mid way through the morning with two secretaries sitting nearby not seeing any foul play. One theory is the warm temperature another is a bird of prey. My thoughts? One of my stray drives from golf last night catching a gust of wind.... its irrelevant really as children what is important is to never compromise on health & safety