On Halloween night three vampires go into a bar and order a few drinks.
1st vampire says, "I'll have a glass of O Positive."
2nd vampire says, "I'll have a glass of O Positive, too!"
3rd vampire says, "I'm the designated driver so I'll just have a glass of plasma."
The waitress turns toward the bartender and yells,
"Gimme two bloods and one blood lite!"