People who you pass to get in front of and then they speed up in order to keep you from passing.
Then they look at you like you are the jerk.
Since I am tired of trying to get people to read my lips as I curse their parents, children, intelligence, driving skills and other traits I have no knowledge about, I am in the process of making a sign from card board and magic marker that will be legible from 10 feet away.
-------------------------------------------
Someone sent me an email with this nugget in it....
You never learn to curse, until you learn to drive.