ROTFL!!! It used to exasperate me when our mother would 'call roll' to get to whichever of us she wanted. My sister is usually called by my name; I'm usually called by mom's sister's name ... We now respond with "No, I'm the other <insert name here>". And now I find it's something I do, too. Is it genetic? Age (gulp)? precurser to insanity?

"Sassy, Livvy, Cassy -- whoever the heck you are, STOPPIT!!!"