If i have a computer controlled squad with me i usally start ranting about how i'm the only one who ever pulls his weight around here.
for expample say my charcaters name is forest: "hey forest, why don't take on that squad over there? hey forest, could you get that tank for us? Hey forest, why don't you clean out that castle full of enemies for us? oh and when your done with that could you go punch out god?"
If i'm solo i usally just start shouting out random directions like i'm trying to throw off the enemies aim. "Oh crap, Oh crap, Left, Right, Straight, Over, THROUGH!!!"
I have a friend who screams "HOT!" over and over again like he's walking on hot pavment or somthing.