I met this cat at a dinner party when I lived in Hong Kong. During dinner one of the guests disappeared to use the bathroom. Twenty minutes later she still hadn't returned. The owner of the cat suddenly jumped up and shouted an expletive which rhymes with ship! He ran to the bathroom and rescued the, by now, terrified guest.
He was a veterinary surgeon - his main interest was animal psychology, and he explained that for some reason, if you let the cat into the bathroom with you, it would attack you if you tried to leave.
Bad kitten experience I suppose!