Some employees are absent from work more than necessary, taking sick days just because they don't feel like going to work. Overall these people cause damage to their company by working less than they should. But then there is another group of employees who, on the contrary, go to work even when they should not. They work a lot of overtime, go to work despite being sick, and in this way try to prove their value to their employer. This often happens with people suffering from workaholism, or if their job is too much for them and they try to make up for it by spending longer at work. Or they are worried about losing their job and they want to get in management's good books. This article will deal with this by no means unique phenomenon, explain how to detect it and what makes it damaging and even dangerous to both employee and employer.