British blood. I remember a British horror film, the type where they had three or four stories, where a stranger visits this town looking for somewhere to eat. He finds all the shops and restaurants closed although it's mid-afternoon. Later, he meets a man in a rush who asks why he isn't inside yet. A couple of minutes later he notices a basement restaurant which is just opening up.
He goes in, sits down and orders the soup of the day. The place quickly fills up, his soup comes, he orders some red wine. He takes a sip of the soup, tomato it looks like, and thinks, this has a strong taste. Asks the waiter who says it's the usual and points to all the other customers who are having it. He takes a drink of his red wine and drops the glass in disgust. Calls the waiter over and asks him what kind of wine it is. Waiter replies, B negative. The restaurant door is locked, the curtains closed, and the rest of the diners move towards him showing their fangs, because - wait for it, they're a bunch of corrupt decaying vampires - a fine metaphor.