Yep, but if it was a big one, I hope it cooled down properly. I don't know the science behind it, but I know a LOT of folks consider refridgerating or freezing butts whole a real no-no. I had a caterer once tell me he froze butts all the time for better flavor, and I've done it, but most folks think it's risky because of bacteria growth. It's not really an issue for me anymore since I think pork loses flavor after being stored in the freezer, whole or pulled.
I know you didn't mention freezing, but if barbecued properly, with a couple of Bear Claws or forks, the butt practically pulls itself, so I always go ahead and take care of them, even if fridging one for leftovers.