This may be the most interesting reason ever given for why an actor flaked: Zach Galifianakis had to pull out of a recent Brazilian press conference for The Hangover Part III because he's terrified of heights. The press conference took place on a peak in Rio de Janiero, and "the only way to get up [Morro da Urca] was by cable car," an insider tells the New York Post. "Zach was too afraid to ride up." The story is true, a Warner Bros. rep confirms: "Zach is afraid of heights," but he called in instead, "and made a few jokes." (Let's hope those jokes were funnier than the movie.)