If somebody at work asked me what I did over the weekend, I just tell them "not much," unless it's something we have in common. For example, I have a vegan coworker, so I'll tell her if I made any good dishes with no dairy, but I don't bother telling her if I go to a concert or something else because I'd doubt she cares. And I never mention bad things that happen, I don't really confide in my coworkers in that way.