Sometimes I wonder about Flatty. Lately he's taken to doing things like happily going outside through his cat door, only to sit at a closed window, minutes later, yowling loudly & mournfully to be let in.
When I go out to check on the noise he happily trots back back inside inside after me - through his door...... Only to repeat the whole process something like half an hour later! Oh god, he's doing it now!
He's also taken to knocking his head with great enthusiasm against his (heavy ceramic) water bowl as I prepare his food. If he gets any more enthusiastic I'm worried he's going to concuss himself.