I have skipped a class, though it was the first time I had skipped, and it was a pretty important class, that class being Biology, so I've never done it to a closer-to-a-core class like that again. I do it to laid back classes such as Robotics/Pre-Engineering (on a day I know will be 'lazy') and it's simply because I don't feel like attending.
If I am in school, I won't skip class, the discipline in Asian schools is beyond extreme, but if theres something important tomorrow, and I want to skip it, I would just pretend to fall sick and there you go, instant skipping of a day in school!
Location: Chicago, wait, is this supposed to be pokemon related? umm Kanto?
I skipped way too many classes in high school. Sometime I would even be in the parking lot and it would just take one of my friends to say "I dont feel like going in" and we'd all just leave. I made some great memories but I didnt really get to enjoy my senior year because I had to work my butt off to graduate on time. I take the occasional day off at college but its not that serious.
I used to skip school from time to time not often though, my parents would make me go to school when I was sick, unless it was really contagious or something. I would occasionally call out of work too( I hated my job) again not often and I would drag myself through work when sick as well rather than call in sick.