Ever had a co-worker that planned for years to retire, had the big retirement party, and headed off into the sunset only to return from semi-retirement to inflict more pain and burden on their former co-workers? We've had several return to the flock in the past couple of years. Whether through boredom or economic necessity they have returned to the library part-time in some capacity. Good for them, right? Not so good for us.
They're here two or three days a week and spend most of their time making personal calls, arranging extended lunches with their friends or washing their hands in the restroom. They do little to no calculable work at all. It's like they're here to socialize and collect a pay check.