On a shidduch date, I saw a couple who were waiting for the elevator. When the elevator came, the boy paused. The girl thought he wanted her to go ahead and walked onto the elevator. The boy stayed behind. Right before the doors closed, she slipped out of the elevator, looking confused. They sat down near us and he said its not tznius – yichud, to go on an elevator alone with a girl.
I almost burst our laughing!