Why Did Only One Window Shatter?

As soon as this guy pours cold soda onto the car window, the glass shatters instantly. But when another guy does the same test, the glass remains intact. You see, car windows are made from tempered glass, that are designed to handle temperature changes far greater than anything a cold drink can cause. So in those viral clips where the glass actually breaks, there’s usually a tiny crack made beforehand. When the cold liquid hits that weak spot, the sudden temperature shock causes the crack to spread instantly.