Close your eyes. Now open them so you can read the rest of this post. When you think of magic boy Harry Potter...
...where do you envision his lightning-bolt scar?
In the books, descriptions of Harry's scar only say that it is somewhere on his forehead.
"Under a tuft of jet-black hair over his forehead they could see a curiously shaped cut, like a bolt of lightning." —from Philosopher's Stone
"He wore round glasses, and on his forehead was a thin, lightning-shaped scar." —from Chamber of Secrets
"He lowered his hand absentmindedly and touched the lightning scar on his forehead." —from Deathly Hallows