user: Question: Name the rufus guest for 15 December 2008
Columns: ['Episode', 'First broadcast', 'Rufus guest', 'Marcus guest', 'Winner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1x01', '27 October 2008', 'Dara Ó Briain', 'Mark Watson', 'Blue (3–2)']
SQL:

assistant: SELECT "Rufus guest" FROM "Table" WHERE "First broadcast" = '15 December 2008';