I was driving in Oxnard the other day, down Rose Avenue.  I turned on my turn signal and began to move to the right lane.  As I moved I heard a honk.  There was no car in my rear-view mirror, that I could see, but the honk had come from that direction so I shifted in my seat and looked again.   There was a car, hidden from my view by the head rest in the back seat.  There was quite a lot of distance between us, so no one was in danger.  I politely moved back into the left lane, but I caught a glimpse of the driver's face.  It was twisted with outrage. 

When things like this happen, I avoid looking at the other person.  Why do I want to see someone flipping me off? But about a mile later, I heard another honk and as I glanced back, I saw the same driver, raising her middle finger at me as she turned right.

Rats!  She got me.  Creative use of the horn.