According to Twitter page Today Years Old, Harry’s scar is actually the shape you’d make when casting the Killing Curse.
The post even comes with a screenshot from the Killing Curse’s page on the Harry Potter Wiki to prove its legitimacy.
Ex-squeeze me?
It's important to remember that Wiki pages can basically be edited by anyone, but it does seem to fit, doesn't it?
Author of the series JK Rowling hasn't responded to these claims, but we're sure she will, and totally surprise us.
Stay tuned!