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How are Game of Thrones [2] characters Tormund and the Hound even funnier off-screen?! Actors Kristofer Hivju and Rory McCann already won fans' hearts [3] with their witty banter and hilarious exchanges on the show, but a behind-the-scenes video of them singing a duet is icing on the cake. Between this hilarious musical number and the dorky video that Emilia Clarke posted of Kit Harington pretending to be a dragon between takes [4], we're officially convinced that the GOT cast is the most fun group on TV. Oh, to be a fly on the wall of that set!