One of the latest meme trends to pop up on Reddit has taken the form of a "time traveler conversation," in which a shadowy figure comes from the future and drops some serious future wisdom on an unsuspecting character - generally to very positive reception. The meme has been meshing well with Area 51 memes, as well as old classics like Shrek and Keanu Reeves. Here are some of our favorite examples of the perception-bending formats.