Three vampires walk into a bar.
The bartender looks at them suspiciously, but decides to serve them anyway. “What’ll be, boys?”
The first vampire says, “Blood. Give me blood. “
The second vampire says, “I too wish for blood!”
The third vampire says, “Give me plasma. “
The Bartender smiles and says, “Got it. Two bloods and one blood-light. “
This joke is included in the Black Book of Jokes. You can order it from here.