Most tongue-in-cheek cameo: Rooney on The O.C. During its first season, "The O.C." was a hip and happening pop culture phenomenon, so it was only a matter of time before some band in need of extra exposure came calling. Enter Rooney. Producers based an entire episode around the band when Ryan, Marissa and company get into some major drama at a Rooney concert. However, seeing Luke (Chris Carmack) awkwardly shout "Yeah, Rooney!" and sing along off-key makes this cameo too cheesy to bear.
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