This is a video news report from CBS Chicago about the protective glass floor of the Willis Tower's 103rd story observation deck cracking while visitors were standing on it (apparently a woman and her two children). The protective glass is a layer above the actual glass support structure of the popped-out window and, according to a spokesperson for the Willis Tower, "No one was ever in danger because the protective glass did exactly what it was supposed to." So....it was supposed to break? Because I feel it should be supposed to not break and traumatize children. But what do I know? I'm just a man who's terrified of heights and slept at a slot machine for two nights in Vegas because I was too afraid to go up to my room. I also lost my condo that weekend. Winning at craps: apparently it has nothing to do with who bets they can take the biggest one.
Keep going for the video news report.
Thanks to Joseph A, who agrees four floors is already one too many.