Bilbo went to be the lucky 'number fourteen', since there were thirteen dwarves in Thorin's party.
Quote:
... You asked me to find the fourteenth man for your expedition, and I chose Mr. Baggins. Just let any one say I chose the wrong man or the wrong house, and you can stop at thirteen and have all the bad luck you like, or go back to digging coal. ...
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- Gandalf to Thorin and Co.
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`A blunderbuss, was it?' said he, scratching his head. `I thought it was horseflies!'
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