I’ll Have A Glass Of AB-, On The Rocks

Stop me if you've heard this one before.

Three vampires walk into a bar. (Yeah, yeah, I know, I know. Somebody's always walking into a bar in these jokes.)

They take a seat in the back, and the waitress comes to take their order. She hesitates, stunned that a group of vampires actually showed up in this dive. But she's a professional, so she isn't thrown for long. "What'll it be, boys?" she asks them.

"I want a mug of blood, if you have it," the first vampire says, while flossing some skin flakes from between his teeth.

"Same for me," the second one adds, absently cracking his knuckles.

The third vampire gives the other two a disgusted look. He folds his hands demurely on the table, then says in a soft and mannered tone, "I would like a glass of plasma, please."

The waitress jots down their order and hands the note over to the bartender. 

Two bloods and a blood light, it reads.