Pretty Little Liars is a show built on twist after twist, so fans have to think outside the box to keep ahead of the writers. No theory is too out there in this universe, which is why every Friday, we like to pluck a Pretty Little Liars fan theory out of the wilds of Tumblr to examine. You never know what might turn out to be right!

This week, we want to talk about a Jason (Drew Van Acker) theory that we've seen a few places that we quite like: That he is the one who almost killed his little sis, but he did it because he thought she was CeCe.

Why do we think this theory is a good one? Here are a couple of reasons.

Mrs. D would protect Jason. Currently, Jason is a prime suspect in Ali's attempted murder because there aren’t many other known characters for Mrs. D to protect the way she did with Jason. The woman buried her own daughter and pretended not to know what had happened. It's hard to imagine her doing that for anyone other than her son.

We can't imagine Jason hurting Ali. On the other hand, from everything we've seen, Jason really does love his sister and wouldn't hurt her. This theory solves that problem. We know Jason and CeCe had a complicated romantic history, and for all we know they also had other secrets between them. Maybe he had a reason to want to hurt her.

Jason was messed up, CeCe was dressed like Ali. Two facts we know about that night: Jason was really messed up, to the point where he can barely remember what happened, and CeCe was dressed in an outfit like Ali's. Put two and two together, and it's not hard to envision a scenario where a confused Jason mistakes his sister for her mentor in evil.

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

Catch the Pretty Little Liars Season 5 premiere on June 10, 2014 at 8 p.m. ET on ABC Family.

Rebecca Martin is an Associate Editor at Wetpaint Entertainment and our resident Game of Thrones, Breaking Bad, and genre TV expert. Follow her on Twitter and Google+!