Credit: Eric McCandless / ABC Family

On Pretty Little Liars Season 5, Episode 4 (“Thrown From the Ride”), we learned that Alison (Sasha Pieterse) has a mysterious scar on her leg that she didn't want the doctor to examine too closely. Why? Clearly, there must be something about how she got that scar that would reveal one of her secrets. But what exactly is she trying to hide?

Each week, we like to explore the wilds of the Pretty Little Liars fandom to find an interesting theory that's so crazy, it just might be true. This week, we decided to look at our favorite out-there fan theory about Ali's scar: That it was inflicted by Aria (Lucy Hale) back during the Season 3 Halloween episode.


If you recall, that episode was the one with the Halloween train. Aria found herself locked in a crate along with Garrett's dead body (ew), and when the crate was being moved, she stabbed one of the people in it.

Could that person have been Ali? It seems like a bit of a stretch, but it would link this scar to a plotline that we already know about. But would Ali really try to kill a Liar? We feel like we can never really know with her...

What do you think of this theory — is it possible, or totally crazy? Sound off in the comments below.

Catch the next episode of Pretty Little Liars Season on Tuesday, July 8, 2014 at 8 p.m. ET on ABC Family.