Who knew Harry Potter could rap? Daniel Radcliffe brought the house down with his rendition of Blackalicious' "Alphabet Aerobics" during a visit to The Tonight Show Starring Jimmy Fallon on Tuesday, Oct. 28.

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The British star dropped his accent for his show-stopping performance, displaying his verbal prowess as he raced through each and every tongue-twisting lyric from the classic 1999 rap hit.

Daniel Radcliffe showed off an unexpected talent on The Tonight Show -- he can rap! Credit: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty

Talking before his performance, the Horns star explained learning all the words to his favorite rap songs was a bit of compulsion for him.

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"Initially I got into Eminem and was obsessed with learning all the words to 'Real Slim Shady'," the 25-year-old star explained. "There's also a guy called Plan B in England. I've always had an obsession with memorizing complicated and intricate fast songs. It's a disease."

Leading the actor into his performance, Fallon asked, "Like Blackalicious 'Alphabet Aerobics?'"

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"That would be one," an apparently apprehensive Radcliffe replied.

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Daniel Radcliffe Is a Rapper! Watch the Harry Potter Star Nail "Alphabet Aerobics"

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October 29 2014, 8:54 AM ET

Daniel Radcliffe is known for being a good sport, which is probably how Jimmy Fallon got the British superstar to rap the entirety of Blackalicious' "Alphabet Aerobics" on The Tonight Show last night. It's an impressive, impassioned, intricate performance (see what we did there?) that demonstrates a keen understanding of the song's lyrics.

Things start off slowly, with Radcliffe seeming to stumble through his attempt at an American accent, but when the song gets to the middle of the alphabet, theHarry Potter star picks up steam and starts ethering his rhymes. It's clearly a song he'd known well before showing up on the late-night talkshow, but the actor might want to work on his breath control (when he got to V, we started to get nervous that he'd pass out). Watch above.

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Watch Daniel Radcliffe Rap Blackalicious' 'Alphabet Aerobics' on 'Tonight Show'

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Actor raps word-for-word Blackalicious' Alphabet Aerobics for Jimmy Fallon.

It seems all those years of muttering incantations as Harry Potter have given Daniel Radcliffe the gift of the rapper's gab.

The Harry Potter star, who is soon to feature in the upcoming film Horns, made a name for himself as of rap connoisseur in a surprise performance on The Tonight Show with Jimmy Fallon.

Talking Fallon through his interest in rap music from a young age, Radcliffe revealed his obsession with learning the words to every song.

Dope Skills: Daniel Radcliffe raps on Jimmy Fallon's Tonight Show.

"I think I was the first kid in my class to learn the all the words to Real Slim Shady," he said.

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But by owning up to his passion for memorising "complicated, lyrically intricate and fast songs" Radcliffe backed himself into a challenge by Fallon: to rap the 1999 tongue twister from Blackalicious, Alphabet Aerobics.

Despite Fallon's admission that the song was "one of the trickiest, fastest songs" he knew, the former wizard star was more than willing to take the mic.

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Daniel Radcliffe a rapper's delight performing Blackalicious' Alphabet Aerobics