On my way through Illinois headed back to Texas, I had this very event happen. I was driving on the inside lane, a motorcycle wanted to merge from the on ramp, and I had a vehicle to my right that made it impossible for me to do anything except keep moving forward. The motorcycle rider became infuriated and made sure to speed up and give me the finger as soon as he could get in front of me. He did all of this in order to exit the freeway at the next exit. The thought of a "speed bump" crossed my mind, but like most things that cross my mind, it faded quickly.
I know many of you are bike riders and would think that due to the extra danger involved that bikers in general would be more careful and more courteous than most. It just seems that there are more members of our society that have the "its all about me" complex and it carries to all aspects of their life and unfortunately that includes driving.