On the way home tonight some do gooder saw fit to take both hands off the wheel, putting up 2 fingers with the left hand & 5 fingers with the right to indicate the posted speed limit since I was catching up to him. In doing so he neglected to put his turn signal on for the left turn that he was about to make. I was making the same left (signal on) & assumed he was stopping to chat with me so was in the process of passing him & turning left when he turned left & I had to tromp it to keep him from turning into me. Sick of do gooders & weenie assed drivers.