Screen icon John Travolta made a surprise appearance at a Grease sing-a-long at the Hollywood Bowl this weekend.

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"Last night at the Hollywood Bowl, for the first time I surprised everyone at the GREASE Sing-A-Long and dressed up as Danny Zuko," wrote in a Facebook post Saturday. "No one knew. Not even the cast. Thank you for a great evening."

The 1978 movie musical was set at a 1950s California high school.

Travolta famously starred alongside the late Olivia Newton-John and Jeff Conaway, as well as Stockard Channing, Dinah Manoff and Didi Conn.