Three vampires go into a bar. The bartender walks up to the first one and says, "What can I get you?"
The vampire says, "I want a pint of blood."
Then bartender then asks the second vampire, and he too replies that he would like a pint of blood.
The bartender then asks the third vampire for his drink order. The vampire says, "I want a pint of plasma."
The bartender thinks for a minute and says, "Let me see if I've got this right. That's two bloods and a blood light?"