Picture it: it’s 2:00 p.m. on a Tuesday in the middle of high school. You’re sitting at a sticky desk in the back row of your history class. And it is getting so boring. The teacher is up there droning on, your eyelids are starting to droop, and you’re watching the minutes on the clock slowly tick by.

But you can’t fall asleep in the middle of class. That would be so embarrassing, especially since the teacher is going to make a scene. You have to occupy yourself somehow. So. you pull out a pencil and start to draw.

You don’t draw just anywhere, of course. You could doodle in your notebook, but where’s the fun in that? No one will ever see it. The teacher had the entire classy open their books anyway, so perhaps It’s time for some prime textbook vandalism.

There are two reasons people vandalize textbooks. The first is because they’re bored. The second is because they know someone else will see their artistic work…sooner or later. And isn’t it nice to know you’ll be giving another student a laugh the next time they’re bored in class? Here are 75 textbook doodling legends.