Jon Snow might know nothing, but in the recently released "7 Days in Hell" teaser, he apparently knows how to play tennis.

"Game of Thrones" star Kit Harrington trades in his Nights' Watch gear for rubber shoes and a tennis racquet for "7 Days in Hell," a tennis-themed mockumentary. Costarring Andy Samberg of Lonely Island fame, Indie Wire narrates that the story revolves around two rivals: the disgruntling Aaron Williams and the daft Charles Poole, who square it off on the court for seven days straight, playing the greatest match of all time.

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Andy Samberg is already a comedy household name thanks to his Lonely Island stint with SNL that blew up to epic recording deals and Youtube videos that amassed a huge following, but as Geek Tyrant suggests, Kit Harington is practically a newcomer in the field of comedy, with a limited filmography ranging from "Silent Hill: Revelation 3D," "Seventh Son," and of course "Game of Thrones." However, being open to projects such as these signifies that the actor is ready to exercise his funny bone to entertain audiences, thus showing his diversity as an actor.

"7 Days in Hell" has the appeal of a genuine documentary, complete with real tennis stars giving their comments on the supposed seven-day match up. The movie received positive reviews at the SXSW film festival where it first premiered last March, and with the list of supporting cast provided by Screen Crush mainly made up of highly amusing people such as Fred Armisen, Lena Dunham, Will Forte, Karen Gillan, and even professional tennis players like John McEnroe and June Squibb.

Overall, "7 Days in Hell" seems like a very fun film. From the stars on board to the cameos, it is highly likely that HBO has a potential cult favorite. It will run for less than an hour, so viewers probably will not get saturated with the in-your-face comedy known of Samberg. Hopefully, HBO creates more gems like these in the future.

Tags7 Days in Hell, Andy Samberg, Kit Harington, Game of Thrones, Lonely Island, HBO