Ok, I'm sure I could do better than this, but most of these were drawn on the back of math tests, theres no need to put lots of effort into that.
Here is the freakish guy who subbed for us in math once. He always had this frown on his face, and he told us to shut up (on one of our class's quieter days).
And here is the sub biting his nose.
This is what happens when you don't do your science homework (Slight exaggeration).
Ummm... snowfuuunks. Click to see a bigger version of that pic.