Drinking from a firehose

I believe it can cause swelling. Maybe that's if there is an allergic reaction. If so, it's a very nasty allergic reaction. My mother always had one because they're so good at cleaning the air, but made us stay away from it (and keep the kids she babysat away from it!

The dog always ignored it too. It's probably only harmful to very stupid creatures who happen to be allergic to it.