Surely it has, to someone, sometime. It never happened to me, but I was staying in a small hotel once when a fire alarm went off after midnight and I was only able to grab a coat and my purse and run outside. Long, chilly wait in my nightgown before the firemen gave the all-clear. And another time I was part of a large group dressed in costume when a fire alarm cleared out a large hotel. That was pretty interesting. Nobody unclothed, though. I’m sure somebody would have contributed a blanket or jacket.