Thanks, 3PO.
1 seconds sound clip from the Star Wars: Episode VI - Return of the Jedi movie soundboard.
You can hear this line at 01:15:47.693 in the Blu-ray version of the movie.
Quote context
[...]
- You see, Master Luke? They didn't believe me, just as I said they wouldn't.
- Put me down! Help! Somebody! Somebody, help! Master Luke! R2, R2, quickly!
- I never knew I had it in me.
(C-3PO MIMICKING DARTH VADER'S BREATHING)
(C-3PO SPEAKING EWOKESE AND MIMICKING EXPLOSIONS)
(C-3PO SPEAKING EWOKESE AND MIMICKING LIGHTSABER WHOOSHING)
[...]