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Zach Galifianakis couldn't win a single game on "Saturday Night Live". Hosting the May 4 edition of the NBC series, he appeared in two sketches about a contest, but he lost in all of them.

Galifianakis played Duncan, a die-hard fan of "Game of Thrones", in "Game of Game of Thrones" sketch. It was a game about the HBO drama series, but Duncan, who dressed as a dragon, got questions which were not related to the show.

To his delight, "Game of Thrones" actor Nikolaj Coster-Waldau showed up to give him the next questions. "I would make a great best friend," Galifianakis told the Jaime Lannister depicter. "We could shower together, and I wouldn't look down, even though I wanted to."

In another sketch, Galifianakis was upset that he got the last place in the 15th Annual Jennifer Aniston look-alike contest. Wearing a blonde wig to impersonate the "Friends" star, he confronted the host played by Jason Sudeikis.

Sudeikis then called out other contestants, Galifianakis' "The Hangover Part III" co-stars Bradley Cooper and Ed Helms, who were tied for the first place. They ended up singing "That's What Friends Are For" which they believed to be a "Friends" theme song.

Also in the episode, Galifianakis parodied Michael Jordan's wedding and Jon Hamm made a cameo in "Darrell's House" skit. Another "Game of Thrones" star Peter Dinklage, meanwhile, appeared in "Weekend Update" to play Peter Drunklage, the brother-in-law of Bobby Moynihan's drunk uncle.

The surprise appearances by Cooper, Helms, Hamm and Dinklage, however, couldn't boost "SNL" ratings. The Galifianakis-hosted episode averaged a 4.4/11 in metered-market households, down 4|percent| from "SNL" last original hosted by Vince Vaughn in April. Still, it topped rating of the night among ABC, CBS, NBC and FOX.