Shephard nods and picks up the knife. "Just for the record?" he says. "I already know there's some nasty habits in my family tree. Grandma Lundberg told me 'bout most of 'em years ago."

He's not really sure what other secrets there might be in his blood- he's got secrets, sure, but they're things like being afraid of the flying monkeys from the Wizard of Oz. He's already come clean about Black Mesa to everyone concerned, so those blood secrets are long since gone...

Well, it doesn't matter. He's just gonna... there's a spot on the back of his right forearm that ought to be okay for drawing the blood. That'll heal up quick enough.