I think that anyone who took this class will agree with me without a doubt..... philosophy! Really interesting as well.
re my intro to philosophy classes: I had a freaking terrible professor. I still had an A with no real effort of studying or anything, but the professor thought that it was appropriate to spend most of the class talking about the Matrix (because of parallels to plato's allegory of the cave) and the rest making it clear that only people who believed in god could be moral because there's no reason to behave if there's no one watching you. We had an out-of-class meeting where we talked about The Hollow Man (because of course what is there to talk about in philosophy other than recent movies?) and he and the teacher's pet both said that if they were invisible they would steal stuff and otherwise do terrible things all the time because they could never get caught. My atheist friend and I both just looked at them side-eyed. I mean sure, I'd pick my nose a lot more often, and never wear clothes, but that's about it...
Anyway, in the end, my friend said this in the teacher evaluation "This was one of the easiest A's I've ever earned, unless you consider listening to this man blather on day after day as part of the hardship of the class, in which case this was one of the most miserably painful A's I've ever earned in my life."
Lots of times it just comes down to the prof.
Incidentally, my easiest class would be either Opera or Symbolic Logic (another philosophy class) and hardest would be either Consolidated Calculus or Quantitative Physiology (also probably the best class I had, but it was a really big class with lots of work and a lab at like 5 on Friday night)
ETA: "Consolidated calculus" (calc I/II crammed into one semester for people who have AB credit but not BC credit from high school - you
can skip Calc I altogether if you want, but they suggested we take this class, which does nothing but take time away from Calc II which is way harder than Calc I) was among my hardest classes - not just because the shortened time in which to learn Calc II, but also because the professor had a thick accent. It took the entire class about 6 weeks before realizing that word he kept saying was "derivative"