I was sitting on the toilet (!) the other day when one of these crawled across the floor in front of me.
Absolutely fascinating! I got down my on my hands and knees to have a closer look, because it was teeny-tiny, and I saw that it had pincers like a lobster. I had never seen anything like it before.
Now before you bug-haters freak out, pseudoscorpions are harmless, beneficial insects. You don't want to be stomping on them! And this is the first one I have seen in all my years of casual bug-watching. Very cool! Here are more links:
Pseudoscorpions factsheet from University of Guelph
An excellent photo by Ed Wiebe