Senior year of high school I skipped as many days as I was allowed to miss, simply because my classes were so easy I really wasn't missing anything.

First semester of college (last semester) I only mainly skipped one class, because it was at 9 am and the teacher posted his lecture notes online, making it pretty unnecessary to really go. I often feel guilty about skipping class, but sometimes there's just no point in going.

Unfortunately, some classes take attendance, and I don't want to lose points off my final grade simply for being too lazy to show up. So a lot of times I take my computer to the more boring classes and download stuff or browse the net while taking notes.