I don't any more but I used to.
The one that comes to mind was an elderly lady who got into some kind of finch-type bird (canaries maybe) instead of cats. She had obviously been letting them breed because there was flock of about 40 of them in the house, all flying together from one piece of furniture to the next.
I found it pretty alarming to begin with but after half an hour or so I could appreciate the beauty of it.
Plenty of bird shit in places though.