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Lord Snow wants to take my place now.' He sneered. 'I'd have an easier time teaching a wolf to juggle than you will training this aurochs.' 'I'll take that wager, Ser Alliser', Jon said. 'I'd love to see Ghost juggle.

George R. R. Martin (2012). “George R. R. Martin's A Game of Thrones 5-Book Boxed Set (Song of Ice and Fire Series): A Game of Thrones, A Clash of Kings, A Storm of Swords, A Feast for Crows, and and A Dance with Dragons”, p.168, Bantam
Lord Snow wants to take my place now.' He sneered. 'I'd have an easier time teaching a wolf to juggle than you will training this aurochs.' 'I'll take that wager, Ser Alliser', Jon said. 'I'd love to see Ghost juggle.