You may feel overworked — who doesn’t — and in need of a mental health day off. But should you mention to co-workers that this Friday you’re going to call in sick and take a much needed long weekend, when actually you’re not physically ill?  Absolutely not, writes Erin Nicole. “It’s best if your co-workers think you’re actually sick when you say you’re sick, so as to not resent your free day and potentially slip about your true whereabouts in front of your bosom” says. Read her other nine tips about what not to share at work.