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Morgan Freeman sucks down helium on "Tonight Show"

Morgan Freeman and Jimmy Fallon do an interview while inhaling helium on "The Tonight Show."

NBC

Somehow Jimmy Fallon talked Morgan Freeman into sucking down helium and going on with his interview on Thursday's "Tonight Show."

"I don't think we should be doing this," the 77-year-old actor, known for his iconic voice, told the host after breathing in some helium from a red balloon. "It's very undignified."

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"Your voice sounds great," an amused Fallon assured Freeman.

Upon thanking the actor for coming on the show, the late-night host asked if Freeman would ever come back on the Tonight Show. He responded, "I'm never coming back."