John Travolta Joins Foo Fighters Onstage for Grease Performance [VIDEO]


The Foo Fighters' show got a little Grease-y when Danny Zuko himself, John Travolta, walked onstage as Dave Grohl sang the opening verse to "You're the One That I Want."


Earlier in the show, Billy Idol joined the band for Generation X's cover of John Lennon’s "Gimme Some Truth."



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