These "SNL" impressions are even funnier when they're done in front of the actual person. Our countdown includes Bill Hader as Dave Matthews, Will Ferrell as Alex Trebek, Jimmy Fallon as Jerry Seinfeld, and more! Which "SNL impression left YOU the most impressed? Let us know in the comments!

Watch more great "SNL" videos here:
Top 10 Most Savage SNL Impressions -    • Top 10 Most Savage SNL Impressions  
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Top 20 Funniest SNL Political Impressions -    • Top 20 Funniest SNL Political Impress...  

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