Three vampires went into a bar and sat down.
The barmaid came over to take their orders.
"And what would you, er, gentlemen like tonight?"
The first vampire said,
"I'll have a mug of blood."
The second vampire said,
"I'll have a mug of blood."
The third vampire shook his head at his companions and said,
"I will have a glass of plasma."
The barmaid wrote down each order, went to the bar and called to the bartender, "Two bloods and a blood light."
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