"Yeah, but that was probably some kind of special reinforced glass meant to resist breaking!" Right, as is virtually all glass used in windows -- otherwise, that shit would be shattering every time a bird flew into it. Even beer bottles are sturdier than anyone thinks -- you would have more luck clubbing someone to death with an empty beer bottle than smashing it over their head, which we know thanks to the combined magic of YouTube and alcohol.
And as for car windows, forget about it -- it's hard to smash them even if you have a hammer, to say nothing of using your fist like in 2 Fast 2 Furious or The Karate Kid, Part II. Hell, a British thief once tried to use a brick to get into a car, only to have it rebound and hit him right in his stupid, freshly bruised face.
We can hear the sitcom laugh track from here.
And if you do successfully break it, you're rolling the dice on what happens to your soft, delicate flesh. Here's a guy who fucking died when he fell through the glass door of a restaurant and had his neck sliced open as a result. The drummer for ABBA died when he fell through a glass window in his home. Glass shower doors -- which are made of tempered safety glass -- send people to the emergency room every year when they shatter.
Even "merely" having a bottle break in your hand often leaves people sliced up so badly they need to go through months of physical therapy and still end up losing the feeling in some of their fingers. We're telling you, you would probably fare better going through the gun-toting henchmen at the door than diving out the window.