My friend and I used to have this notebook we would pass in between us during class. Literally the most embarassing things were written in this notebook. Most teachers thought we just used it to take notes and never really said anything. Untill we once made the mistake of writing in it during historyclass while we were supposed to be watching a movie. The teacher took said notebook from us and spend the full hour reading everything we had ever written down nudging the very cute intern everytime he found something interesting. And boy oh boy did we write stuff about our hot history teacher intern. End of the hour me and my friend were almost under the tables in shame and arguing on how to get our notebook back. At last I had to ask the fucking intern to get our notebook back since the teacher already had fled the scene
I thought my wife was searching my browser history, so after clearing it, I made sure to do searches on stuff like "how to be a better husband" and shit like that. Having a fake note for Mrs. Anderson in case you're caught is the same idea.
this is what I'd do on some of my teacher's classes