I'll start this off as I was going to reply to another thread and got thinking about this.

I once received an anti-social behaviour letter from the housing asc asking me to tell my cats not to mess on my neighbours concrete driveway! I'd only been in the house for 3 days - the cats hadn't been out once, let alone crapped or peed in anyones driveway obviously they'd be digging down through the concrete and then covering it up again. I took a picture of the terrier that was doing it and emailed it to them, I also explained to them that I could ask or tell my cats but they really didn't understand English to which the reply was well what language do they speak ... erm ... I dunno cat? This conversation went on for about 4 days via the email system, I wish I'd kept my old email to show everyone as the replies were really funny. Basically it boiled down to a typo at their end which instead of cat was Kat so they thought it was a human.

I also when I was a kid had a persian cross female cat who obviously had long hair, she got a little knot in her coat and because of problems (she was poisoned with rat poison when she was a kitten and then kicked around so she ended up a little brain damaged)that she had it was difficult to brush her and almost impossible to get a pair of scissors close to her, the vet didn't want to put her under as it wasn't causing her any problems, but the local kids insisted my cat had 5 legs (it did eventually come out and it wasn't actually that large but yeah she looked kinda strange).