<p>In my PG year I helped cast Billy Zane as Matt in a student-directed high school production of The Fantasticks. I don’t remember being blown away by him but he was the obvious choice, both because he could act and because he was the best looking guy trying out. But then I had absolutely no theater experience and was just helping out my overwhelmed classmate. (Still think I should be able to say I launched his career. 
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<p>The one working actor I can think of from my high school (someone you’d recognize) didn’t come to acting until he suffered a lacrosse injury and had to bow out for the season. If I remember correctly it was sophomore or junior year. I don’t think anyone but the drama teacher recognized his talent, but the teacher worked with him and supported his application to Juilliard, to which he was admitted. He’s currently on a prime-time series. </p>