The best choice is to play the game "Sleep Time". It's an amazing game that can be played at your school or at your home. I usually play on school, but that's me.
I usually play CoD, but right now I'm on an extended vacation from that. So, I play the game that I'm addicted to. Right now, I'm addicted to Oblivion. So that's what I play.
It depends where I am... If I'm on my PC, I play Achievement Unlocked 2 and then look for some other cool games on this site. If I'm on my DS, It's usually whatever games I have on it. Currently, it's Final Fantasy I. GBA Slot + Car Boot Sale = WIN!
Demons Souls.. only on ps3, but its flipping hard. Takes a LOOOONNGGG time to pass Ive had it for months and i dont think im halfway yet. So its a good game to sit down and play when your bored
I can't believe no one said Just Cause 2. That game is the ultimate in killing boredom. What other game lets you parasail w/o a grappling, kill people with grappling hooks, blow stuff up to progress with the story, drive over 100 vehicles on land/air/sea, and play as a bad*** Hispanic dude? On Armor Games I play Flood Runner Armageddon.