Strelka Institute for Media, Architecture and Design/flickr LinkedIn Influencer Travis Bradberry originally published this post on LinkedIn. Everyone makes mistakes at work, but some are worse than others. Never over-promise and under-deliver, and avoid sucking up to your boss. Backstabbing, negativity, and gossiping are habits that can ruin your reputation. No matter how talented you are or what you've accomplished, there are certain behaviors that instantly change the way people see you and forever cast you in a negative light. We've all heard of (or seen firsthand) people doing some pretty crazy things at work.