Luke and Leia having a blast.
Darth Vader has his own theme song, which was written by John Williams. It’s known as the Imperial March and was introduced in the Empire movie, then and used in Jedi and in the prequels to show when Anakin was turning to the dark side of the Force.
Harrison Ford not fixing, but laughing.
In The return of the Jedi, when Darth Vader picks up the Emperor and throws him down the Death Star shaft, listen carefully. This is the one and only time the Jedi theme music plays during a shot of Darth Vader, reflecting his return to the light side of the Force.