I was 3rd in line at a red light on the way home. About 5 or 10 seconds after I'm stopped, the car behind me honks, not just a beep, but probably a full second or two. I slowly crane my head around to give the, "where-do-you-expect-me-to-go? look". Then the driver shouted out her window, "oops, I slipped!". I waved to say, no big whoop. Then I started thinking, what was she doing in her cage behind me at a red light that caused her to slilp into her horn for a full second? It was pouring rain and couldn't see that much detail through my mirror.