NBC/"The Office"The first few months of a job can be nerve-racking, for obvious reasons. They can also be exhilarating — if you were known at your last job as the office goofball or the guy who always missed deadlines, here's your chance to make a great impression on your new coworkers. But in an effort to wow the entire office, too many people wind up looking foolish instead. That's according to Lynn Taylor, a national workplace expert and the author of "Tame Your Terrible Office Tyrant: How to Manage Childish Boss Behavior and Thrive in Your Job." "People make this mistake in their first 100 days on the job: They try to impress their boss and everybody, including their CEO," she told Business Insider.