VIDEO : Jimmy Fallon Does His Best Neil Young Impression Yet With The Real Neil Young

Tuesday night's Tonight Show episode was one for the ages as Jimmy Fallon got to recreate his popular Neil Young impression with none other than the real Neil Young. Neil Young joined Jimmy Fallon Tuesday night for a duet about the apocalypse and time travel. Everyone knows Neil Young is adament about treating the Earth with respect and in this made up duet the premise is, is that Neil Young as come back from the future to "warn us." As they sit on a tree stump the two Neil Young's sing, "Used to be a tree trunk/ but look what we've done."