What you said about a ghost being after him is exactly how he is acting. He loves lay on the back of the couch and last night he fell off when he jumped up suddenly. Thankfully, he's fine. I guess he's tougher than I think. I did just give him his flea medicine the night before the day he started acting funny, if that makes any sense. But, it's been about 36, 48 hours so... Maybe it's that? Hmm. I gave him a mL of children's Benadryl and he's sleeping a bit now. He just got his summer cut a few weeks ago, so he doesn't have to get his bottom wiped.
It does remind me of what he does when he gets something caught back there though, he just doesn't.