Have you ever put your thumb over the cold water tap in the bath. As you reduce the diameter of the flow, the velocity increases.
So imagine your lungs being full of air. They are forced out your trachea, thus increasing the velocity. Now imagine your muscles spasming involuntary whilst your larynx is closed. The pressure build up is equal the force of 50 elephants standing on a two pence piece. So the moment your larynx opens, you release a shock wave of air travelling at hypersonic speeds. It was probably the pressure of this shock wave that fractured the glass.
You're just lucky that you caught your HOX straight on (probably why it didn't move). If you would have caught it side on, you could easily provided enough force for it to reach escape velocity. Rather tricky to explain to the insurance company that you're HOX is now in geo-stationary orbit.
I'd be more careful next time.