These three vampires walk into a bar...

Three vampires walk into a bar and sit down at a table. The barmaid comes over and says, "What'll it be, gents?"
The first vampire says, "I'll have a mug of blood."
The second vampire says, "I'll have a mug of blood, too."
The third vampire says, "I'll just have a glass of plasma, thank you."
The barmaid turns and yells out to the bartender, "Table six: Two bloods and a blood lite!"