…We were born vampires." "I thought you became –" "— vampires by being bitten? Dear me, no. Oh, we can turn people into vampires, it’s an easy technique, but what would be the point? When you eat… now what is it you eat? Oh yes, chocolate… you don’t want to turn it into another Agnes Nitt, do you? Less chocolate to go around." He sighed. "Oh dear, superstition, superstition everywhere we turn.
Terry PratchettLittle fussy Otto, in his red-lined black opera cloak with pockets for all his gear, his shiny black shoes, his carefully cut widow's peak and, not least, his ridiculous accent that grew thicker or thinner depending on who he was talking to, did not look like a threat. He looked funny, a joke, a music-hall vampire. It had never previously occurred to Vimes that, just possibly, the joke was on other people.
Terry Pratchett