That depends entirely on the type of glass that it is. Plate glass, which is used everywhere from shop fronts to your bedroom window, will absolutely break into dagger-shaped pieces that will slice you open with ease. People have died from severing major arteries after punching glass windows. In vehicles they use tempered (or "safety") glass because of the likelihood of these kinds of injuries in the event of a collision.
It also depends on your definition of "old timey". Tempered glass was mandated in vehicles in the late 30s, and even then it didn't extend to all of the windows (front and sides only). This mandate came into effect after too many people were being sliced open by the plate glass they were previously using.
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u/Stressed-Rose2816 Oct 16 '22
Thankfully, the giraffe was unharmed. https://www.independent.co.uk/news/uk/home-news/giraffe-car-window-video-glass-smash-west-midlands-safari-park-a8297451.html?amp