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Bilbo is turning 111th and gives a party, as it is a special occasion and he leaves by using 'the one ring'. Everyone in the Shire but Gandalf is surprised how he disappeared. Bilbo finds 'the one ring' in 'The Hobbit', the prequel to 'The fellowship op the ring', when Gandalf took him on his first journey. Bilbo wants to leave and explore middle-earth Gandalf isn't surprised, because he knows Bilbo has 'the one ring', being the one that took him on a journey in the first place.