Here is another one:
People that don't use their turn signals
What is up with this...did they purchase cars without a functioning turn signal, or is it really just so d@mn difficult to reach down and flip the little turn-signal lever.
I absolutely hate when I am at a 4-way intersection...or any other turn off, and some dumb@ss in front of me either just turns without warning; or if you are waiting for them to pass (on the opposite side of the road), and they turn.
Oooooo...it ticks me off to no end!!!!