1. An Introduction
2. Traffic Light Theory
3. Does Harry know we know he knows we know (what???)
4. So Harry likes Louis?????!
There's a more detailed idea of this theory here, but the gist is that this project started before Harry started wearing a blue bandana ALL THE TIME, which would lead people to believe he knows what the fandom is talking about.
5. Larry Stylinson
If true, it's quite possibly the saddest (but greatest???) love story of all time. From what I've gathered there's probably too many instances to count, but if you really want montages of Louis and Harry supposedly 'together', youtube is chock full of stuff.