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Article:

Be a Joker, Not a Jerk: 7 Dos and Don'ts of Workplace Humor

Don't make fun of others

There may be endless punch lines in your co-worker's '80s mullet, but one too many quips could get you punched.

Don't tease someone to get him or her to loosen up, feel more relaxed, or feel included unless you are positive he or she will take it in the manner in which it is intended.

Good-natured teasing about someone's habits, physical features, or actions can backfire.