You know him as the hunky star of “One Tree Hill” and “How to Make It in America”—but if you knew Bryan Greenberg in high school, you’d have known him as a class-clown-turned-persona-non-grata due to his prankish public announcements. (Aha! We knew that adorably smirky, quirky grin was hiding a past full of shenanigans.) And in this clip from Bryan’s upcoming appearance on “When I Was 17″ (airing Saturday at 11 a.m.) he reminisces about the time that a PSA went SNAFU.
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