The women piss breaks kill me. Just as you find a good opening in the traffic, they gotta take a leak.
Another good one I recall from last week was when using the cruise and you come upon a slower car (in the passing lane), when and if they finally decide to get over, you resume the cruise and as you get next to them, they decide to pace you, speed up, get a good way ahead of you, so you get back in the slow lane and do it all over again a mile down the road. That's one of my favorites.