My favourite class period right now is a tie amongst AP English Lit, Accounting I, and Theatre Arts II.
AP English is amazing because I simply love English and writing. The class is fun, and our teacher is quite interesting.
Theatre Arts II is closely behind simply because it's awesome being an upperclassman actor in the class (we have no senior actors with experience) because I find it fun to assist younger actors and be our new teacher's go-to person. It's really different from being the underclassman, because there's more pressure. However, I maintain that it isn't that big of a deal.
Finally, there's Accounting I. For me, it's right after lunch and it's a class I kind of look forward to simply because there's only four people in the classroom not including the teacher, and I'm the only one in Accounting I - the other three are in Accounting II (or Advanced Accounting, I guess). I like Accounting simply because it's methodical and tends to work out well. While there are a lot of steps involved, it becomes a bit routine after a while, and I know such a class is beneficial once you're out of school. :)
So yeah, I can't pick between those three XD;