Classroom lectures and discussions can be quite boring especially when they are too long. Sometimes we have no choice but to sit through the lesson, struggling to focus although there are times when it feels impossible. It’s all to easy to get drowsy and end up falling asleep in class. For some students, their way to battle boredom is to skim through their textbooks and draw funny pictures on them or write hilarious captions. While some end up being great, the other doodles were made to make someone else laugh.

Here are a few crack-up textbook doodle examples collected on the internet.