Yeah, I thought that was a Japanese thing. Something to do with an old Japanese superstition that a man's head gets full of blood when he's aroused. Anyway, I'm not a big fan of Japanese humor; or anime for that matter.
Oh, so its a old Japanese superstition? Huh, never knew that. One: because Im stupid and lazy, and two: I didn't bother checking its background, like Supernatural, but in that show they do their history.
Definitely going to be a reoccurring character
"OIL"
Two axes: check
Oil: Che- Wait, what?!