I get fucking pissed when an old person takes too long to get out of the car when they're being dropped off at the door. Bonus pissy points if they decide to continue their conversation even after they get out of the car.
But yes this is absolute bullshit and pisses me off too. Another one that gets me pissed are people who park in the crosshatched spaces; the ones that are usually on the sides of handicap spots so they can comfortably get out of the car. I'm not handicapped myself, but that's some absolute grade-A bullshit.