Ducky has a new girlfriend on 'NCIS' (Tue., 8PM ET on CBS), and like any good girlfriend, she listens to him. So when he says he figures that by this point he's unlikely to ever see anything new at work, she pounced.
Because she loves him so much, she decided to give him something new to appreciate. Isn't that sweet? Only, it turns out Ducky wasn't as appreciative as she had hoped he'd be.
At first Ducky was impressed with this new killer, but on reflection he shared with his girlfriend that he found the killer to be "Sick, twisted, vicious and there's nothing novel about what he does. I cited his creativity, when in fact he doesn't create a thing."