John Travolta shocked fans when he made a surprise appearance at a “Grease” sing-along event.

Dressed as his character Danny Zuko, Travolta walked on stage to lead the crowd in a collective chant of his onscreen gang, the T-Birds, and the response “wop-bop-a-loo-bop” that features throughout the 1978 hit film, according to the Independent. 

Director Randal Kleiser and “Grease” cast members Barry Pearl (Doody), Didi Conn (Frenchy), Kelly Ward (Putzie), and Michael Tucci (Sonny LaTierri) all shared their surprise when Travolta stepped onto the stage.

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