Three vampires walk into a bar. The waitress comes up to them and asks them what they'll have. The first vampire says, (Transylvanian accent inferred) "I'll have a glass of O Positive." The second vampire says, "I'll have a glass of AB Negative." The third vampire says, "I'm the designated driver. I'll just have a glass of plasma." The waitress turns toward the bartender and yells, "Gimme two bloods and one blood lite!"