I love reading the notes I collect in class. They are too funny and dramatic.
Honestly, you should keep all of them and then turn them into a coffee table book. Seriously. Like PostSecret. I bet you would make a TON of money!
I have one on my fridge right now, because it was an apology note. And I have to say that they are extra funny, because English is not their first language, and sometimes they don't know the correct word...I might burn in hell because of that, won't I?