Haha, I already recognize at least two things in this thread. I also feel like I'm being chased when I go up the stairs sometimes, but that's only when it's a little dark. I also pee on the inside of the bowl of it's one of those toilets with the hole in the center, because I dislike the noise.
Also, I tap my feet and fingers a lot. Like, a lot lot. It's almost always because I have a song in my head and I listen to a lot of metal so it seems like nervous tapping when it's actually just fast air drumming. When I'm nervous, I actually stop tapping.