If you’ve ever had the misfortune of working with a toxic colleague or working for a toxic boss, you know how high the personal and professional cost can be. “Toxic” is a word that gets thrown around a lot these days, and there are endless guides on how to identify a toxic employee—and even how to categorize different types. (Apparently there’s a lot of bad behavior going on at work.) But I think we all know a toxic colleague when we encounter one.