I'm looking for a link to an old YouTube remix fad, akin to niconico douga and things like that (everyone's seen those Old Spice Red Zone remixes, right?).

Anyway, it drew from some random source (the one I'm looking for in particular had the infamous octagon source) and had a red tinted video on the left and a blue tinted video on the right. This was from around 2011, maybe? Probably later than that. Any leads would be appreciated.