Okay, this will be quick. But it's good lesson.
A few minutes ago, I was working on a drawing that features a lot of laughing people, including a teacher. I was really unhappy with the way the teacher's body language looked. (I find adult body language somewhat harder to capture than kids'.) So, on a whim, I grabbed my copy of William Steig's Shrek, flipped through the many pages of expressive body language that Shrek uses, and voila! I found a laughing Shrek. Just what I needed to improve my own sketch of a laughing teacher. Better, yes?
Keep your mentors at your side at all times, people!