The Millennium Falcon escapes from the Death Star, and in a moment of down time, Luke notices he has a wart on one of his fingers. He mentions this to Han Solo, who says Luke must have gotten it when they were soaking in the garbage chute, but it’s no problem, because Chewbacca thinks they had some Compound W in their last smuggling shipment, and Han finds a package in a hidden compartment. So Luke uses it, and the wart disappears just in time for the big rebel meeting to plan the Death Star attack. Luke shows this to Han Solo, saying: “I got it! I got it!” And Han says: “Great, kid! Don’t get cocky.”
Then, as a tag, we see Luke flying his X-wing fighter, when he notices another wart starting to sprout on one of his fingers. He says: “Not another one!” And then we hear Obi Wan Kenobi’s voice say: “Use the Compound W, Luke.”