One of my biggest pet peeves is promptness. If there's one thing that will send me into a blind rage is either being late for something, or having to wait on someone, who is late.
Thanks to some key people in my past (one for always being late, and the other who drilled on being prompt, the Lombardi Method - always be 10 minutes early), this has turned into a complex/pet peeve of mine.
I'm sure the waiting on someone else is more for my impatience, but as for myself, I'm always at least 10 minutes early for any appointment.
*Thanks to Carol for letting me borrow his watch!*