No! They'll Pry My Mouse From My Cold Dead Hands
Common expression. Moving on.
The Cake is a Lie! From Portal out of the the Orange box. Penny Arcade has a shirt: http://www.pennyarcademerch.com/pat070441.html and vgcats has a flash comic: http://www.vgcats.com/comics/?strip_id=250
I Don't Want To Go On the Cart
Monty Python reference. I feel happy!
Yes! Master Chief is my Master Now
I reference to the master chief from the Halo series implanted in a Star Wars quote.
I Mouselook With CowboyNeal
Mouselook is a technique used to look around your character and CowboyNeal is CowboyNeal.
Really, I think portal is the only thing that isn't common and if you don't know what it is, you should give it a try. Portal = Awesome