Yup. I remember in 5th grade the boy next to me cut his knee. He started wiping the blood off with his finger and licking it. I FREAKED the f@ck out! I was all, "NO! You can't do that! That's not right!!" He just looked at me confused and said, "It's my blood."
Nowadays however, I'm a rare, bloody, steak eatin' fiend! LOL!