Lord of The Rings: Fellowship of The Ring - Disappearing Chain
When Boromir tries to take the ring from Frodo, the ring is on the chain around his neck. He then puts it on and runs away. When he runs into Strider (Aragorn) and shows him the ring, it isn't on a chain. But when he is running away, the ring is back around his neck.
Hey! I've seen this movie a 6 times, and I'm about to go see it 7 this weekend. But my mom and I also noticed that the ring is sometimes on a chain and sometimes not. But like someone already said, maybe he just keeps taking it off the chain and then puts it back on. It's possible! :o)