We are not in the old days, now phones cost hundreds of dollars. If anything happens to my phone, I will be very upset afterwards. I cannot ignore a serious financial loss for a moment's relief. But I think it would be better to break the glass with a stone, etc. instead of your hand.If you are really insist on breaking to glass. Or what should we do if we try to be calm somehow? Say what ? I recommend meditation. Inhale, exhale, inhale, exhale, repeat this 10 times, both the phone, your good hand, and the window glass.