The color of your blood?
(Henry Rollin's answer to the "interview" question "if you were a crayon, what color would you be and why?" he replied "the color of your blood, so I can write your name all over your bedroom's wall and let your parents know what kind of a useless moron you are" or something similar. Funny stuff.)
EDIT: here is a more accurate quote
I'd be the color of your blood, so i could write on the wall of your dorm "i'm a pig" and show it to your mother after i'd killed you and stuffed you in a hole, you turgid piece of dog shit! this is what you go to college to learn? ...