Daniel Radcliffe stunned the viewers on Tuesday night's episode of 'The Tonight Show' with an epic rap from Blackalicious' 1999 Track- "Alphabet Aerobics."

Memorizing 'Alphabet Aerobics' is said to be no easy feat-with 338 words following all of the letters of the alphabet and with numerous phrases that seemed like tongue twisters.

The video showed host Jimmy Fallon asking the 'Harry Potter' alum what kind of music he enjoys. The audience laughed when Radcliffe shared his appreciation for rap, including a taste for rap from legendary emcee Eminem.

"I think I was the first kid in my class to learn the words to 'The Real Slim Shady'," he said stressing his obsession with memorizing "complicated, lyrically intricate and fast songs."

"It's a disease," he chuckled.

That's when Fallon reaches for something under the table and presented Radcliffe with a microphone and asks him to prove his rap skills by rapping the complicated Blackalicious song.

Memorizing "Alphabet Aerobics" is hard enough, but rapping it altogether is not an easy task, and Radcliffe did not disappoint. Along with the Roots, he perfected every line in "Alphabet Aerobics" as the tempo slowly increased, while Fallon held up corresponding letter cards in the back.

Radcliffe's performance granted him a standing ovation from the live audience during the show-and everyone was absolutely shocked in amazement.

After filming the episode, Roots drummer, Ahmir Khalib Thompson, also known as Questlove, took to Twitter and prompted the members of Blackalicous and its fan base to watch the show.

"dear @realgiftofgab & @ChiefXcel make sure you and the entire @blackalicious_ fan base watches & dvr's #FallonTonight. trust. #!!!!!!!!" the musician excitingly shared.

Meanwhile, the show also featured Radcliffe and Fallon exchanging goofy voice impersonations. Radcliffe mimicked a Texan, while Fallon trying to imitate a Cockney accent.

Radcliffe also shared that he learned to do the American accent partly by watching WWF and notes that his favorite wrestler was Dwayne "The Rock" Johnson. He even joked that they should team up for a "buddy film comedy."