Hahaha, of course. I don't do it as much as I did last year, when I had a full schedule, but I still do it from time to time.
Usually, I get to school about ten minutes after I'm supposed to be there and depending on my mood, I'll walk around the halls before actually stepping into the classroom. In some classes, I occasionally ask for a pass to the nurse, my locker, the guidance counselor, or something else and end up... not going there at all and walking around the school building a few laps. Basically, our school is a box on top of a box, so there's limited walking space. I usually come back with the pass and say "Oh, they told me to just come back. n_n"
I ALWAYS skip the very end of gym class, though. That's around 11:14, which is the time I'm about to leave. The gym teachers always make us stay in the gym before the bell rings, but before they have a chance to stop any of us, I usually just walk out, go to the main office, sign myself off, and go home.
Last year I would always skip classes to go hang out in the art wing, though. Lunch included (I didn't eat at school, for the majority of the year, anyway).