To like the taste of your own blood?
When I was in middle school I used to get hurt a lot, as a result my arms often would bleed, tiny cuts here and there from working with my dad and whatnot. But I got into the habit of "Licking my wounds" I actually kind liked the taste, it was always a semi-sweet flavor. but then It became a habit of picking off the scabs and licking up that blood too.
Ive stopped since then, but I just got a cut today and it reminded me of that, have any of you licked your own wounds? drank your own blood? Picked your scabs?