Roll over Munchausen
List of strange afflictions has,
"Foreign accent syndrome....Without warning, they'll start speaking their native tongue with a different accent, which could sound anything from Swedish to South African. Victims need never have heard the accent in question...". I have met many people who suffer from this, especially if they are talking to foreigners. White-collar workers in service industries call it mirroring the accent while commentators like Srinath and Laxman Sivaramakrishnan don't even realise that they have it.
"Capgras syndrome...This syndrome involves the delusion that a significant other, such as a parent, spouse or other relative, is being impersonated by an imposter. Sufferers sometimes attack the supposed double...". Countless Hindi film heroes, heroines and their sisters have suffered from this. Amongst most notable victims is Ganguly when he attacked Chappel's doppelganger in Zimbabwe.
and "Emotional blindness...occurs when people exposed to confronting images - violent or erotic - fail to register other stimuli for a short (about one-fifth of a second) but critical period thereafter - a hiatus that doesn't occur after looking at more innocuous images..." A bigger post is required to detail out instances of this. Happens to the best of us every day.
How many you had?