Think before you speak.
What you say on your first day on the job doesn't just influence what your colleagues think of you - it could end up costing you the gig."If you say something that's off, it sets the tone, and that could be the reason for you to be let go in your first three months," says J.T. O'Donnell, the founder of career-advice site Careerealism.com and author of "Careerealism: The Smart Approach to a Satisfying Career."
"It's natural to want to be liked - to impress and fit in quickly," says workplace expert Michelle Kerrigan. "However, many try too hard, and talk too much when they should be listening."
Here are 22 things you should avoid saying - especially on your first day on the job: