Kind of obvious, but surprised at how many people don’t heed this advice…
When meeting with clients or potential business partners off-site, don’t discuss your impressions of the meeting with your colleagues until the elevator has reached the bottom floor and you’re walking out of the building. That’s true even if you’re the only ones in the elevator.
Call it superstitious or call it polite—but either way, don’t risk damaging your reputation by rehashing the conversation as soon as you walk away.
via Business Etiquette: 5 Rules That Matter Now | Inc.com.