It's basically been all over the Starcraft 2 scene like 1.5 weeks ago or something like that, due to it being played overly much at the GSL... Then I linked it to my brother, and last week has basically been filled with "OPPA Gangnam Style! OP! OP OP!" in our skypecalls and TS during Raids.
Usually doesn't stick around for more than a week tho sadly, I can say out of experience.
But yeah, Elevator Guy is awesome. Have Day9 as elevator guy. http://i.imgur.com/5gCOg.gif