Every single day when I'm driving there is always:
-Someone who drives 20mph under the speed limit
-Someone who drives 20mph over the speed limit and hugs my bumper
-People who don't indicate at roundabouts/junctions
-People who do not know how to use a roundabout - you give way to the right therefore there is no need to just sit there when the right hand is being blocked by oncoming traffic therefore you can go! 
-People who do not use their lights - hello? I cannot see you (especially in the fog we had the other week)
-People who don't bother to move in traffic and cause an even bigger hold up, when there is a huge gap in front of them. Please. Move. Up.
-Those big bloody 4x4 cars that always seem to hug my bumper
-People who drive all over the road/on the white lines/on the verge of the road - why can't you drive in the middle like everyone else
-People that cut you up - I'm sorry but you are aware that I am coming towards you, why are you pulling out which then requires me to brake from my 40mph to your measly 10mph whilst you try and build your speed up.
Tbh, I don't care if I'm being unreasonable - these things hassle me on a day to day basis and I am fed up!
:o