Spoilers for IT Chapter Two continue below!
Stephen King is no stranger to cameoing in adaptations of his novels, yet it still was a bit of a surprise to see him pop up in IT Chapter Two as the shopkeeper at the Second Hand Rose, where adult Bill (James McAvoy) reunites with his bike Silver. This is a cameo that director Andy Muschietti and screenwriter Gary Dauberman have been dreaming up for a while, though King was initially cautious to say “yes” to the role.
“With Stephen King, my hero — I grew up reading him, so he’s one of my life heroes — and I got to know him. I discovered a very loving and funny guy, and I wanted him in the movie, so I offered him a cameo,” said Muschietti at the IT Chapter Two press conference. “The first thing he said is, ‘Well, you have to consider that I’m a jinx. Every movie that I’m in, it bombs.’ So I said, I guess we should give it a try. I think we’re going to be fine.”
Source: IGN.com The Story Behind IT Chapter Two's Big Cameo