I hate it when people can't wait for me and make a fuss about me leaving things to the last minute (because I mentally precisely time everything, I know the minimum amount of time it is going to take me to do something).
However this has got to be my worst personality trait by a country mile; my road rage and explosions at at sight of queues in airports and ski resorts have made me infamous in my family. I expect everything to happen seamlessly and at the snap of my fingers...and if it doesn't, I can get angry very quickly.
"How dreadful!" cried Lord Henry. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is hitting below the intellect." ~ Oscar Wilde - The picture of Dorian Gray