I was on a two lane road once, in the fast lane, driving the posted speed limit right at dusk. I noticed car headlights coming up behind me at a very high rate of speed and realized it was a cop. I assumed there was a hurry to get to an accident or something. I switched lanes to get out of the way, but found myself pulled over instead. The cop kept asking "why did you change lanes like that?" And I kept replying that "you were doing what looked like 90mph coming up behind me, what reasonable person wouldn't?". Really felt like the guy was having a bad day and looking for someone to take it out on. He wrote me a ticket.