When Pippin looked into the Palantir of Orthanc, why did Sauron believe Pippin was the ring bearer?
I'm just a couple of chapters into The Return of the King, and it isn't clear to me from the movie, so I'm not sure why Sauron thought Pippin had the One Ring just because Pippin picked up the Palantir of Orthanc and looked into it (and had his Palantir experience)? Why did Sauron conclude that Pippin had the One Ring?