Sakura: Oh god, oh no, Naruto what's your blood type

Naruto, weakly: uh... red

Sasuke: actually the blood is blue while it's still inside your body

Naruto, bleeding out slowly: oh yeah we should probably get some blue then

Kakashi: How do you know?

Sakura: That's not-

Sasuke: veins are blue

Kakashi: maybe that's just what color veins are

Naruto, pale, about to pass out: just... get a lil of both and mix em