Daniel Radcliffe needed no special wizardry on “The Tonight Show” Monday to show off a talent he’s been honing for years: the ability to rap. As he told Jimmy Fallon, “I’ve always had kind of an obsession with memorizing complicated, lyrically intricate and fast songs.”

You can’t mention something like that in front of Fallon and not consider the gauntlet thrown down. So Radcliffe (on to talk about his new movie “Horns”) grabbed a microphone and stood before the audience to blaze through Blackalicious’ “Alphabet Aerobics.”

Meanwhile, Fallon stood behind him with lettered cue cards (a la Bob Dylan’s “Subterranean Homesick Blues” video) and helped the audience follow along.

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