Three vampires go into a bar. The bartender goes up to the first one and say, What do you want? The vampire says, “I want a pint of blood”.
Then bartender goes to the second vampire and asks what he wants. The second vampire says he wants a pint of blood too.

The bartender goes to the third vampire and he says, “What do you want?” The third vampire says, “I want a pint of plasma”.

The bartender thinks for a minute as says, “Let me see if I've got this right. That's two bloods and a blood light?”