I'm sure you all know me well enough to know I'm not at all trying to rationalize with prequel knowledge. I just thought it was interesting enough to point out. I especially find it interesting in the wording itself. As MeBe pointed out, Leia was able to shut him down, so I find it interesting he specifically said that Darth Vader could shut him down rather than just any old shmuck who knows the first thing about technology. Interesting aspect, though, that anybody can simply say, "Shut down," to a droid. One, I would think that a droid would only obey his master's directive to do that. Two, it renders 3PO's quote as something of an exaggeration. But thanks for the clarification.