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Professor Snape, a.k.a. Alan Rickman, struck fear in the hearts of Hogwarts’ students in the Harry Potter films, but there’s nothing more magical than hearing Rickman’s voice influenced by several mouthfuls of helium.

Back in 2013, Jimmy Fallon and Benedict Cumberbatch did their very best impressions of the actor during what they called a “Rickman-Off.” So, when Rickman himself appeared as a guest on The Tonight Show on Wednesday night, he was ready to confront Fallon — armed with two “truth-telling” helium-filled balloons.

“This is really like a James Bond show, this really is,” Fallon said. “I’m very sorry you were offended, I’m very sorry. And welcome to the show.”

The two laughed their way through the remainder of the interview, with Fallon finally getting the actor to say “Harry Potter” after he’d taken a few puffs from his helium balloon.

Watch the full interview below.