The Shocking Story of a Broken Window

Me and my maid were having a sleep over in my room. Out of absolutely nowhere we hear this massive bang and my wall-length window totally shatters. My dad flies into action, such as since the pantry to keep us safe. The police find a huge solid ball bearing presumably from a truck or an airplane. It landed less than 20 cm from where my friends foot had been. If it had hit one of us, it could have killed us.