The hardest class you've ever taken.

[x2theone2x]

Ethics. Staying awake was damned near impossible.

I had a college philosophy class that was taught by an 80 year old man in a rocking chair. I thought I was going to rot away myself.

That reminds me of the music appreciation teacher on my campus. He is beyond boring, nice(somewhat), and is almost about to croak.
He randomly stops talking in class, closes his eyes, and leans back and forth like he's going to fall, sometimes doing this for up to five minutes.