When I was younger I had a tendency to touch corners, like corners of televisions, tables and stuff and they had to be touched correctly. Like, there was a compulsion to touch the corner, and if I moved my hand over it in one direction, it felt wrong, like as if the corner was made of skin and I just pulled all the skin back revealing an open wound. So, I had to move my hand over it in the opposite direction, after first moving my hand over it in one direction, so that it felt better (putting the skin back over the open wound).
I dunno why, but even thinking about it know gives me a semi-compulsion to do it.