Movie star Brad Pitt joined TV host Jimmy Fallon this week by yodelling from the rooftops of New York.

Pitt appeared on Late Night With Jimmy Fallon on Tuesday night to promote his new movie ‘World War Z’, which is released this Friday. Pitt plays the part of a former UN troubleshooter Gerry, in the apocalyptic horror film.

During the comedy skit the stars engage in a "conversation" high above the city about the new movie before Pitt challenges Fallon to something that's "never been done before."

The conversation started with small talk, "Jimmy? What are you doing up there?" "Yodeling … you?" "Same" -- before Fallon congratulated Pitt on World War Z.

Pitt then came up with a “crazy idea”.

"You wanna try a double yodel?" Pitt asked.

Fallon's reply? "A double yodel? But that's never been done before!"

Watch the video below

Jimmy Fallon And Brad Pitt Yodel A Duet Atop NYC RooftopsScreengrab