"No I'm not bisexual, I have dual sexuality disorder!"

Me, to a dude who after complementing me on my attire apologized to me, saying that he knew it was not my _market_, and in response to my surprise - "What do you exactly mean?" - concluded that I must be bi-sexual! Oh Capitol Hill. 

PS: Does the fact that I find incidents such as this fascinating and greatly enjoyable, mean my response was  factual and not sarcastic?