Dear ****head in the green Audi,
Just because you are lost in Cambridge does not give you the privilege to creep down the road between 10 and 15 miles per hour for the entire length of Broadway street. I enjoyed your frequent stops in the middle of the road as you chatted away on your phone, I'm sure trying to get directions.
Pull over next time, jackass. When I passed you out of frustration, held my phone out the window, and yelled to you to hang up and drive, you were still to oblivious to the world around you to take notice. Apparently you are just too bewildered about the idea of planning ahead or at the very least being courteous on the road.