Mark Hamill is truly the ultimate resource when it comes to behind-the-scenes knowledge of the Star Wars franchise. He has previously revealed his favorite scene from Star Wars: The Last Jedi and his thoughts on his final appearance as Luke Skywalker in The Rise of Skywalker, as well as giving hilarious explanations for old set photos. Hamill often responds to fan questions about the films on Twitter, and he recently gave an inside look at a moment from Episode IV.

Twitter user @CharlestonBrian posted an image with text that read: "Luke's line in A New Hope, 'I can't see a thing in this helmet,' was not scripted. Mark Hamill said this to Harrison Ford when he thought the cameras had stopped rolling. They, however, decided to leave it in." Naturally, Luke Skywalker himself had something to add.

"It was not scripted, but I said it when I knew the cameras were rolling. I knew it didn't matter because I had the helmet on & no one could see my face anyway. Everyone liked it, so George [Lucas] let me keep the line in subsequent takes. #TrueStory," Hamill explained. You can check out the exchange below.

It's fun to hear about unexpected movie moments that made the final cut despite not being planned. With any luck, Hamill will continue to reveal Star Wars facts and trivia for years to come. And in the meantime, all nine movies in the Skywalker Saga are currently available to stream on Disney+. Watch with a subscription here.