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Keenan Cahill, YouTube Sensation

We're embarrassed to admit how many times we watched this strange teen's take on Katy Perr's song, "Teenage Dream." His expressive eyes, his energy on the chorus and just sheer dedication? Addictive. Even Perry gave her seal of approval. Later, he collaborated with 50 Cent, but we can't say the magic was still there. He struck gold once and, in this case, there's no shame in being a one-hit-wonder. -- Jethro Nededog, Zap2it Related: YouTube teen's 'Teenage Dream' cover gets Katy Perry's approval YouTube
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