Favourite rants; people who approach a junction on the left of the road then turn right, or vice versa, normally indicating at the last possible nanosecond just to keep the driver behind guessing. That blocks off the whole junction until said tank driver has cleared off into the distance, leaving following drivers who could have made alternative turns fuming in its wake.
Two; the driver who, having entered a dedicated right turn filter lane, sits there with the indicators flashing and the brake lights glaring directly in the eyeline of the following car. Do these fekkin idiots think we can't see that they're stationary, or which way they're going?
Three and finally, drivers who pull out into your path on a 30MPH road and cause you to brake, then waddle off as if next week is good enough - if they're gonna get in your way, then the least they could do is to get a bloody wriggle on!