A YouTube VIDEO makes us laugh because it shows a stupid burglar foiled by running into a glass door. In all seriousness though, walking into glass doors can be highly dangerous. I remember a childhood friend who cut herself badly when mistakenly going from the kitchen to the patio through what she thought was an open sliding-glass door.
And, in an unverified story, about 20 years ago, a friend told me about staying at a highrise in Toronto. The party got a bit wild and attendees started running from one end of the apartment to the other. One fellow had the misfortune to stumble against the huge glass living-room window, which then broke. He fell to his death.