Just this, really - 12yo old lady has suddenly taken to spending the evenings hissing, yowling and spitting at her own reflection in the window. It would be fine, but her attacks are a bit random and I jumped so much last night that I dropped a big dish & nearly lost a toe 
There are no cats out there terrorising her in the dark - our neighbours had two that used to attack her (well, one was young and wanted to play, but she didn't see it that way) but they moved out a month ago. It's not dementia, is it? Any ideas - the windows in question don't have curtains, unfortunately.