A couple weeks ago a mysterious rapper named Captain Murphy appeared alongside Earl Sweatshirt on the Flying Lotus-produced Adult Swim single, "Between Friends." Many assumed he was a pitched-shifted Tyler, the Creator, but Murphy denied it via Twitter. Another popular theory is that he may be the rapping alter ego of Flying Lotus himself, or some combination of Tyler, Lotus and Earl. Today, the enigmatic spitter shared "Shake Weight," which features maniacal laughter and Mad Villain-esque wandering over TNGHT’s "Bugg'n." Whoever he is, he seems to be having a lot of fun. Download "Shake Weight" and stream additional tracks below.