Two fisted/footed drivers (automatic trans only, one foot on gas, other hovering over the brake)
Passengers who tell you to turn as you are passing the turn.
Blue-haired biddies who can barely see over the steering wheel of their land shark who mosey on the road at 20 below the posted limit, regardless of what the limit may be, or they drive a flat and very regulated 20.
People who pass, get in your lane, then slow down to below the limit.
People with pickup trucks who don't wanna scratch the bed paint. (Why are they driving pickups?)
Getting stuck behind some jalopy that would be banned in most states, spewing black smoke for a 1/4 mile behind him, and YOU CANNOT GET BY.
Those scary drivers who leave their turn signal on....who might just turn.
Tourists. Nuff said.
If I were any more laid back, I'd be in a coma.