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The Law of Diminishing Talent: The more accents, impressions, or tricks one packs into a YouTube video, the worse each trick is. That's why the two funniest "impressions" videos of the year so far are parodies. Those are below, but so is this video from Amy Walker, who introduces herself in 21 regional accents.

While she may not be a cosmopolitan master, she's good enough to make the gimmick work without any punchline or plot. Her Texan accent, for example, sounds like a glass of Splenda-saturated sun tea; her L.A. is flawless and most of her other American accents passable. (Her Scottish sounds fake but so does the accent of my actual Scottish friend.)

Amy Walker's 21 Accents:

Too bad that dozens of mediocre actors try the same trick instead of getting one voice truly spot-on. That's why parodies so beautifully skewer the laziness of the YouTube impressionist:

Awkward Pictures, 50 Perfect Impressions:

Scott Gairdner, One Million Impressions: