Give Blood

[Chipchopper]

A guy drives to a well known department store in the US, and notices a temporary "give blood" facility had been set up within the parking lot.
The old veteran decides to do his bit and joins the short line of like-minded folk and give some of his blood.
As he waits to go in the door, he meets another man who is coming out, he says to the man, "well done buddy, it's a good thing that you did in there". "No problem" the man says, I was just passing, on my way back to the reservation, when I spotted the sign".
Guy: "so are you a full-blooded Cherokee ?.
Man: "no not any more, I'm about two pints less"