John Travolta gave fans some ‘chills’ when he made a surprise appearance at a Grease sing-along in Los Angeles Friday night. 

The 71-year-old artist, who is said to have declined a role in American Gigolo, revisited the past by reprising his iconic role as Danny Zuko from the 1978 musical classic.

‘Tonight at the Hollywood Bowl, for the first time I surprised everyone at the GREASE Sing-A-Long and dressed up as Danny Zuko,’ he announced on social media, sharing the exciting moment.

‘No one knew. Not even the cast. Thank you for a great evening,’ he said.

He adopted his character’s swagger as he stepped on stage wearing dark jeans, a tight black T-shirt and a black leather jacket.

The actor, who has been sporting a shaved head, donned a wig styled into a greaser-friendly ducktail, along with a scruffy beard.

John Travolta gave fans some ‘chills’ when he made a surprise appearance at a Grease sing-along in Los Angeles Friday night

He then joined Grease cast members Didi Conn, Barry Pearl, Michael Tucci, Kelly Ward, and director Randal Kleiser on stage.

Grabbing the microphone, Travolta delivered some of his famous lines from the scene where Danny Zuko reunites with his Summer Nights sweetheart Sandy (originally portrayed by the late Olivia Newton-John) on the first day of school at Rydell High.

‘I thought you were going back to Australia!’ and then remembering he was the big man on campus, dropped into the nonchalant, ‘that’s cool, that’s cool, that’s cool baby,’ I’m rockin’ and rollin’ and whatnot.’

He then lead the cast and audience in a chant of ‘A-wop-bop-a-loo-bop-a-lop-bam-boom!’,

Standing in front of a big screen, he then told the crowd, ‘Enjoy the show. We love you!’

‘You are simply ICONIC and sooo loved, wrote a ‘hopelessly devoted’ fan on Travolta’s Instagram account. 

‘Wish I had been there. Awesome!’ wrote another.  

Grease was an instant hit when it opened in theaters in June 1978. 

The actor donned a wig fashioned in a greaser-friendly ducktail like the style his character Danny Zuko sported. Travolta also wore a scruffy beard

Travolta swaggered on to stage wearing a pair of dark jeans, a tight black T-shirt and a black leather jacket

Original cast members Didi Conn, Barry Pearl, Michael Tucci, Kelly Ward and director Randal Kleiser were as surprised by his appearance as the audience

Grease remains a fan favorite more than 40 years after its release. It has earned more than $396 million worldwide via re-releases and sing-alongs such as the event at the Hollywood Bowl

Both Travolta and Newton-John earned Golden Globe nominations for their portrayals of star-crossed teens Danny and Sandy.

The soundtrack—which has sold more than 30 million copies and topped the Top 40 radio charts—went on to win an American Music Award for Favorite Pop/Rock Album.

The original song Hopelessly Devoted to You, sung by Newton-John, was nominated for a Best Original Song Oscar.

The movie musical, based on the hit stage show, went on to earn more than $396 million worldwide through re-releases and sing-along events like the one at the Hollywood Bowl.