Funny, right? What kind of an idiot would do that?
spoiler
Me
I'm the idiot that did that. Thankfully, some seniors sent me this year's calendar; so I have missed class only for the first week, and will appear from the second.
In my last semester I may or may not have had a class that I never attended but was intensely stressed about the final exam since I'd never seen a whit of material. I graduated without it somehow and in recent years have started to suspect it was never real and was just a persistent nightmare I'd have where I'd look at a schedule and see I missed the class.