Things to do in a boring, sleep-inducing class

Here is a list of things to do in a boring, sleep-inducing class:
1) Count the number of times the lecturer tries to tell a joke that fell flat, or if the lecturer is flat himself, count the number of times that you are grateful that the lecturer actually tries to tell a joke.
2) Paint the Mona Lisa on your friend's arm with markers, highlighters and pens. If they can do it with toast, I bet stationery works even better. You can both admire it during the break later.
3) If it gets really, REALLY boring and if you feel really, REALLY sleepy, give the person in front of you a very hard kick. Make sure he is the biggest guy in class. When that person turns to look at you, just smile. Wait for a bit and see what happens. With any luck you may find yourself with a black eye. Or worst. Adrenaline works better than any amount of caffeine.
4) Here is a trick I learnt from a guy in my class, given here with some minor adjustments to maximize the entertainment value. If you don't know the person behind you, turn and stare at him/her. Turn and stare repeatedly with a creepy smile. Whisper the word "watermelon" into your friend's ears repeatedly. Then turn and stare again. Its always fun to irritate or mess with someone else's head.
5) Write a song about your boredom. Then write another song about your boredom . Then write another, and another song about the boredom you face in class. Make sure all the song sounds almost the same, ala Taylor Swift. If lady luck is on your side, someday you might have a successful recording career just like her.
5) When all else fail, leave or just let yourself fall asleep. You'll be surprised at how liberating it can be.