Are you the that runs toward the elevator and jams an appendage in before it closes? Or do you slow down before you get there so the peeps already on the elevator don't see you and give that "oh, sorry...I couldn't reach the button, sucks to be you...SUCKAH" look?
I give them a cold stare with that "I'm remembering your faces --- I WILL see you later". Scare the fuck out of them. I also do that with chicks and ugly kids sometimes.
I was once on an elevator with a blind woman and her seeing eye dog. The elvator stopped, opened up, and two black women were standing there. The looks on their faces was priceless. They were not getting on that elevator with that German sheppard lol. I guess they caught the next one.