It's hard to imagine Star Wars without Mark Hamill, but there was a point where it was far from a sure thing he'd return. Speaking to The New York Times, Hamill revealed that he held out on saying yes to returning for Star Wars: The Force Awakens until he lost his excuse for saying no.
Harrison Ford said yes.
Carrie Fisher, as he recounts, said yes almost immediately, but Harrison Ford had been holding out so he used Harrison as an excuse.
“He’s too old and too rich and too cranky,” Hamill said. “He’s not going to do this.” But when Mr. Ford said yes, Mr. Hamill realized he had to agree, too: “Can you imagine if I was the only one to say no? I’d be the most hated man in nerd-dom.”
Describing why he wasn't sure about coming back, Hamill said, “No one wants to see the 50-, 60-, 70-year-old versions of us, running around, bumping heads on the Death Star.". In essence, Hamill was reticent to come back because it would be like trying to catch lightning in a bottle twice.
The fact that Hamill references a fan favorite head bump here, something tells us he knows Star Wars fans pretty well. You'd think he'd know we'd all be thrilled to have him back.