It's no surprise that Daniel Radcliffe likes rap—in our October cover story, he told us that his favorite karaoke jam was "anything by Eminem." Last night, while on The Tonight Show to promote his movie Horns, Radcliffe told Jimmy Fallon that "I've always had kind of an obsession with memorizing complicated lyric-y intricate and fast songs"—then proceeded to prove it, absolutely slaying Blackalicious' "Alphabet Aerobics." You can watch the video above. Enjoy!