The 'House of the Dragon' cast, including Matt Smith, Fabien Frankle and Tom Glynn-Carney, revealed which costar causes them to break out in laughter while on set of the 'Game of Thrones' prequel series during a New York Comic Con panel on Oct. 20.
https://people.com/house-of-the-dragon-cast-reveals-the-costar-that-cau…