My patience when it comes to painfully slow drivers. You know the ones, when you're waiting to turn out of a junction but a car coming on the road you wish to join is a little bit too close to pull infront of, so you wait. Then they slow down, right down. They travel sooooo slowly passed the junction and cause you to miss a gap in traffic because they're still in the way. I usually follow them, get out and kill the occupants of the car and burn it all down. Need to curb that a little bit.