This is a legitimate question and I think your response is overly harsh and unnecessary to the conversation. You don't know this person and are projecting a bias on them. Even if they did want to play video games after their scheduled shift, that is their prerogative. Unscheduled required overtime is a mis-management issue and should not fall on the backs of workers. Everyone should be given consistent schedules and if there is an opportunity to make more money working overtime should be given the choice to do so or not.