Jemal Countess/WireImage 1 / 15
Jemal Countess/WireImage 1 / 15

NEW YORK (AP) -- Shooting a love scene with Charlize Theron would be a dream come true for many actors, but for Patton Oswalt, who co-stars with the Oscar-winning actress in the new movie "Young Adult," the experience was "a nightmare."

"Why do I have to be in my underwear next to the most physically perfect person on the planet? Why couldn't I have been next to John Goodman or Michael Moore in their underwear?" said Oswalt at the film's premiere Thursday night. "It was a dream that turned into a nightmare."

The dramedy, which opened in select cities Friday, stars Theron as Mavis Gary, a boozing, delusional author of young-adult novels who returns to her hometown to win back her happily married high-school sweetheart, played by Patrick Wilson.

Mavis forms an unlikely bond with nerdy former classmate Matt Freehauf, played by Oswalt.

Oswalt said he kept a souvenir from his time on the set with Theron — post-traumatic stress disorder.

"Every time I hear a car backfire, I think I'm getting naked again," he joked.

The film, directed by Jason Reitman and written by Diablo Cody, goes into wide release on Dec. 16.

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Online:

http://www.youngadultmovie.com

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Nicole Evatt covers entertainment for The Associated Press. Follow her on Twitter at http://twitter.com/NicoleEvatt