7. What They Think Someone Else Does in the Bedroom

A good 111% of the people you work with do not want to know that you bet they’re tigers in the sack. There’s no more surefire way to creep someone out than to let them know that thoughts of their love life have entered your brain. Anything from speculating on a colleague’s sexual orientation to making a relatively indirect comment like, “Oh, to be a newlywed again,” plants a permanent seed in the brains of all who hear it that casts you in a negative light.

Your thoughts are your own. Think whatever you feel is right about people; just keep it to yourself.

8. That They’re After Somebody Else’s Job

Announcing your ambitions at work when they are in direct conflict with other people’s interests comes across as selfish and indifferent to those you work with and the company as a whole. Great employees want the whole team to succeed, not just themselves. Regardless of your actual motives (some of us really do just work for the money), announcing your selfish goal will not help you get there.

9. How Wild They Used To Be in College

Your past can say a lot about you. Just because you did something outlandish or stupid 20 years ago doesn’t mean that people will believe you’ve developed impeccable judgment since then. Some behavior that might qualify as just another day in the typical fraternity (binge drinking, minor theft, drunk driving, abusing people or farm animals, and so on) shows everyone you work with that, when push comes to shove, you have poor judgment and don’t know where to draw the line. Many presidents have been elected in spite of their past indiscretions, but unless you have a team of handlers and PR types protecting and spinning your image, you should keep your unsavory past to yourself.