Grease fans were treated to a surprise they’ll never forget when John Travolta showed up in character as Danny Zuko—leather jacket, swagger, and all. Fans at Friday night’s “Grease” sing-a-long at the ...

Grease fans have got chills, and they were multiplying on Friday night after a surprise visit from a very special visitor. John Travolta dusted off his leather jacket and brought Danny Zuko back to ...