The Ineffective Middle Finger

There are ways to be effective and ways to be ineffective. I'm guessing that most people have the goal of being effective. Only a dumbass would strive for ineffectiveness. Well, I met one such dumbass last week. Here is the story of our encounter......
I left work and took the exit for 95 south. I go only one exit until I take the route that travels east to take me home. A car behind me headed down the ramp to 95 south, at close range. Rather than go around me, he remained closely behind me in the right lane. We both took the exit to head east. Upon merging onto the eastern route we both wanted to move to the left lane as there was slower moving traffic in the right. Here is where the fun began.
As I was in front of the tailgater on the southern route, on the ramp to the eastern route, as we merged onto the eastern route, I was still in front of him as we moved into the left lane. Apparently, this was not pleasing to him and caused anger. He shoved his hand very far forward in the front window and raised his middle finger. This was effective. It revealed that he was angry and didn't like me. It was even effective in that it elicited a raised middle finger from me in return. Because there was a line of cars to the right, he couldn't go around me which may have led to more frustration.
Having exchanged middle fingers following proper protocol, I believed our encounter was over. However, being the good driver that I am, I followed the 3-second rule and looked in my rearview mirror. It was at this time that I noticed the angry man driving with both hands on the wheel with the middle finger still extended. My thought was "whatever". However, the finger continued to be extended as I drove on. In fact, this continued for the entire eastern route of 13.8 miles. 13.8 miles?!?!? Wow.....that is one angry person.
Funny thing is that after about mile 2.4, it was losing its effectiveness. It became funny, but was also no longer the most noticeable thing on the road. Just as a hood ornament can be seen as you glance in the rearview mirror, the finger remained in place. This person's anger with me caused him to lose his control of the situation. Eventually, it turned around and my behavior controlled his action........ for 13.8 miles.
Now, that's ineffective.....but it was really funny!