Kenny's expression after killing Larry (if you help him). It mirrored my own almost exactly.
Lee in the Drug Store: "You wanna get violent you old fuck?! Then come on! You better be ready to kill me though, because it's ME before ANYONE ELSE!"
Larry at the Dairy: "Cool yer jets there Rambo" and: "I got charm comin' out of my ass!"
And of course, at the Dairy, Lee shouting "IT'S OVER!" to Andy.