The word we fosters togetherness. It makes the listener feel connected. It gives a subliminal feeling of "you and me against the cold, cold world." When you prematurely say we or us, even to strangers, it subconsciously brings them closer. It subliminally hints you are already friends. At a party, you might say to someone standing behind you at the buffet line, "Hey, this looks great. They really laid out a nice spread for us." Or, "Uh-oh, we're going to get fat if we let ourselves enjoy all of this."
