How to kill time during boring lectures

This is today's ENT (Ear, Nose, Throat) lecture. Azeem and Asad were drawing and making boats and kites out of paper while Saad and Noman were playing cricket. So here's a good idea for you. In a boring lecture you can utilize paper or you can play cricket. In case you don't know how to play cricket: Each guy has a team of players noted down on a paper. The one who's playing first opens a book randomly again and again and the second guy notes down the last digit of the even page number; 2, 4, 6, 8. That's the first player's score. When the last digit comes out to be zero the player is out. Total is done in the end and compared with the other team. See? Cricket is an adult's game. There are so many other things that we do during lectures (the boring ones only, we have to listen to the professors'). I'll post those too. ;-)