The star of ‘Harry Potter’ showed off his impressive rap skills during an appearance on NBC’s The Tonight Show.

Host Jimmy Fallon challenged the actor and hip-hop fan to rap Blackalicious' tongue-twisting "Alphabet Aerobics" and Radcliffe delivered the lyrics without skipping a beat. Just watch:

“I’ve always had an obsession with memorising complicated lyrically, intricate and fast songs I guess,” the actor told Fallon. “It’s a disease.”