NEW YORK, Oct. 29 (UPI) -- British actor Daniel Radcliffe wowed the crowd at Tuesday's taping of The Tonight Show Starring Jimmy Fallon where he rapped to Blackalicious' "Alphabet Aerobics."

"I am a big fan of rap, which surprises a lot of people about me," the former Harry Potter star told Fallon.

Revealing he loves American hip-hop artist Eminem and the British rap act Plan B, he went on to say, "I've always had kind of an obsession with memorizing complicated, lyrically intricate and fast songs.

"It's a disease," Radcliffe confessed.

After Fallon asked him if he knew "Alphabet Aerobics" by heart and Radcliffe swore that he did, Fallon presented the 25-year-old actor with a microphone and a challenge.

Radcliffe then perfectly performed the rap, which Fallon had moments earlier decribed as "one of the trickiest, fastest songs" he knew.

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Daniel Radcliffe raps 'Alphabet Aerobics' on 'Tonight Show'