The Reddit user is predicting that Anakin Skywalker placed a message inside C-3PO in the same way that Leia did with R2-D2—and there might be something to this. J.J. Abrams has made it clear that he wants to pay homage to the original trilogy (and prequel trilogy) in his big finale for the series. Having the final film relay a message via a droid–but from the Dark Side of the force this time–would certainly mirror nicely with the beginning of the franchise. The theory continues:I even believe when Vader said “it is too late for ME, my son” he was speaking a very deeper meaning...Warning Kylo and Rey of the Emperors lies. Not to make the same mistake. Then circling right back to where Kylo was talking to Vader’s helmet. About “finishing what he started”. Which was to bring balance/be the chosen one. 3PO - the message is the melt your mind scene!What if this theory is true? Considering the context here it's really not too far of a leap. C-3PO could carry extremely important information from Anakin Skywalker. And something could activate the message, turning his eyes red, allowing Vader's voice to speak through the droid—like telling Rey or Kylo how to defeat Emperor Palpatine. Who knows, "Dark Threepio" could be the key to finally killing off the Sith and bringing balance to the force once and for all.