I work in an office building. Our company has offices on the 4th and 5th floors, my desk is on the 5th. One morning I was getting into the elevator on 1st floor. There was another gentleman, older, already in the elevator. He had pressed the button for the 8th floor; I pressed the button for the 5th floor. Just before the door closed, a woman got into the elevator. I recognized her as someone who worked on the 4th floor for the same company as me. Without the man noticing, the woman and I acknowledged each other with only a polite, very slight, nod. He did see me however when I reached out and pressed the button for the 4th floor.

When we reached the 4th floor, the woman got out of the elevator without saying a word. The man looked over at me, astonished. How did you know? The elevator door closed. I gave him a coy smile and raised my eyebrows.

We reached the 5th floor and the door opened. I got out and turned around. As the door was closing, I looked back into the elevator and told the older man, calmly, monotoned, "When the elevator gets to the 8th floor, don't get out."

I have never seen a person press a 7th floor button so fast in my life.