(NBC)Who knew Daniel Radcliffe was such a killer emcee? Jimmy Fallon, apparently. Radcliffe was on the Tonight Show Tuesday to promote his new movie, Horns, and while he was there got a chance to show off his rap skills for a national audience. Watch him work his way through Black Thought's "Alphabet Aerobics" with Black Thought standing right there, silently judging him the whole time. Don't worry, though! He totally passes.