I have heard some crazy theories in the past but this one is pretty insane. Apparently the internet believes that Sam Smith and Adele are the same person.
The theory came about from people playing with some of their audio. If you pitch down Adele it does sound a kind of like Sam Smith singing. Same goes for if you pitch up Sam Smith. I have to say it's pretty freaky to listen to.
The biggest issue that I have with this is that we've seen both of them singing live and in person at various concerts and award shows. Unless this is the best lip syncing I've ever seen, there is no way that is true.
Then again, Milli Vanilli tricked all of us.