Actually you did nothing to the compass. I'm sorry to have to inform you of a small, but funny, coincidence. At the exact time you were fiddling with the compass, I was turning on all the lights in my house. Because I've routed the cables myself, I coiled them around a massive iron beam, thinking that I'd need a big magnet at some point. I had forgotten all about this and then some of my relays started acting funny. So I turned on all the lights to see if all the relays worked, and found out one was, and still is, sorta broken.
To make a long and supremely interesting story short, my house is a magnet and I broke your compasses, sorry.
EDIT: Oh yeah, and I want to be recognized as the FIRST PERSON ON THE LFS FORUM, with a house that's a magnet.