Apparently I'm an idiot. I was refilling the tank on my ultrasonic humidifier, and left it turned on while I did so. On my model, the tank lifts up and off from the base, which is where the ultrasonic wafer is. Well, I got the tank off, and the humidifier turned on. There is a little basin in which the wafer sits, and it was creating a 2 inch fountain above it, some of which becomes the mist.
Well, being the curious person I am, I decided to touch that little 2 inch fountain of water, just to see what it felt like. Big mistake. Initially, I couldn't anything, it felt like cold water running over my finger. Then after 2 seconds *bam!* my reflex kicked in and I yanked away my finger, and a split second later felt this horrible pain I can only describe as similar to being shocked by 120 volts of electricity. I've been shocked before, and this felt extremely similar. It hurt like a mother.... ! It's been an hour now, and I still feel a deep, throbbing pain inside my fingertip that isn't subsiding. And it's bright red.
As soon as this occurred I wanted to kick myself. They use high pressure water to cut through steel for crying out loud. Those molecules pack a punch under pressure. Well, I should have guess that when moved about at ultrasonic speeds, they would also pack a punch. Ugh.
So there you have it, today's little science lesson at my expense.