1.pretend to drop a pen onto the floor then take the chance to pluck your neighbour's leg hair.
for this to work make sure you are sitting beside some hairy beasty guy and i dont really want to mention names but hint: JER_MY or Y_NING (shes not a guy btw). be sure to listen for the high pitch scream and watch out for the volley of punches
2.Dig your nose and flick your dirt onto someone else (1 3 5)
nothing beats the sheer pleasure and sense of accomplishment when you relieve yourself of the sticky ball of dirt. and what better way to get rid of it then to flick it high up in the air and watch it fall onto someone's head? if you can calculate the projectile motion accurately together with the velocity at which the ball flies, you might just make it land on you lecturer's head! if its the really sticky kind, fret not, just ACT as though you brushed against your neighbor's shoulder then swiftly clean your fingers on him. as recommended by someone in ACJC, the best way to remember this is 1 3 5. just do the hand actions for numbers 1 3 5 and you will get it.
3.draw MR monster

heres my mr monster. when its hot draw some bikinis, when its cold draw some blankets. mr monster is going to be your good friend from now on. when its lonely, draw some friends. talk to mr monster everyday. you affection will make mr monster grow and one day it will become your invisible friend. congratulations, you are now a social psychopath.
4.watch SBW sleep
if you really want pure entertainment, then look over at SBW's table and watch the way she sleeps during lectures. she is well known to sleep like a beauty and furthermore, many positions available too. if you really lucky, you can catch her lying like a pig with all her trotters spread out on the table and best of all, with her mouth OPEN!!! such form of unglamness is certainly unbeatable. want to make life even more exciting? you can compete with her to see who can come out with the top unglam sleeping position within the confinements of your seat. i have tried and the best i could come up with is slumping on the chair, head yanked back, mouth open and SNORE.
5.irritate your table mate
this is probably the most fun you will ever have during lectures. just turn to your table/chair mate and tell him/her something random stuff eg. i turned to Yang Zhi and told him that i like him and he gave me the priceless i-am-so-sick-of-you face. some suggestions:
"i think i am the cutest person on earth."
"do you think i will die a virgin?"
"i think my boobs are HUMONGOUS today." (have not and will never have the chance to try)
"i think i want to be a gigolo in the future." (i try this all the time)
"i think vany leong is the sluttiest whore on earth!"
"is there any veggie stuck on my braces?"
the list goes on and on and on after all, randomness never runs dry.