hey i can't answer it by myself so i referred wikipedia :)
Pollak is also known for having one of the best Christopher Walken impersonations in show business. One specific Walken impression routine, "Frankenstein never scared me", has become one of the most requested sound bites on the Bob and Tom Show, and the routine is a code word to see if another person is a Bob and Tom fan. In an appearance on Late Night with Conan O'Brien, Pollak recounted that he was invited to introduce Walken at the unveiling of his Star on the Hollywood Walk of Fame, despite the fact that the two had never met.

Pollak is also notorious for his impression of William Shatner; specifically, imitations of Shatner's role as Captain James T. Kirk in Star Trek. In a 1994 special edition of Canadian TV Guide, published to commemorate the final episode of Star Trek: The Next Generation, Pollak writes a guide of how to do an impersonation of Kirk. Shatner himself has said that Pollak does the best impersonation of him that he had ever seen.
Source(s):
http://en.wikipedia.org/wiki/Kevin_Pollak

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Christopher Walken
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His Christopher Walken is amazing.... but I have to say his Peter Faulk is the most disturbing! James T. Kirk is also killer.

http://www.youtube.com/watch?v=Yc3yZnrAaIk
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It is said to be Christopher Walken Impression. But I suggest you see "the Aristocrats" very hilarious.
Source(s):
http://en.wikipedia.org/wiki/Kevin_Pollak

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Peter Falk as Lt. Colombo
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easy. Christopher Walken.
Source(s):
i remembered it, but the vid is via YouTube via The Aristocrats.

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Alan Arkin
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This question is actually funnier than he is. Kevin Pollak has been beating his Shatner impression into the ground for years. Star Trek hasn't been on the air since 1969! The only thing lamer than a William Shatner impression in 2009 is a Jerry Seinfield impression. Does he do one of those too?

And for the record, Jay Mohr does a better Christopher Walken impression.
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