Can Ghosts Swim?
Ghosts tend to stay away from nature for some reason. For instance, there's never a ghost in a tree. I'm not sure ghosts can climb trees at all! A ghost would just float up into a tree and then probably stop midway and think "Why the hell am I doing this?" then come back down. I think the same applies to swimming. A ghost would AT BEST float through the water, which I don't consider to be swimming. If you're floating in a pool no one points and says "Look at how good a swimmer that guy is!" because that's not swimming, that's floating. Ghosts can't swim, case closed.