A female friend of mine has recently started seeing a young chap who has more than his fair share of tattoos.
He has a number 13 tattooed on the back of his neck which apparently means something. Errmm ..... *Scratches head*, well I ain't got a clue what it's supposed to mean

She's tried asking one or two of his friends, but has been met with the same reply, usually along the lines of, "it's not for me to tell you", or, "you'll find out soon enough".
In my opinion, the only reason she isn't being told what it means, is 'cos it's something dark and sinister - why else would they not tell her? I may be a million miles off, but I'd like to know just in case.
Anyone know what a number 13 tattooed on the back of your neck is supposed to represent?