Rules for achieving a mediocre or better Christopher Walken impression:
1: Let’s begin with the difficult one: the New York accent.
2: Always pronounce one syllable words using two syllables
3: You have to pause... occasionally... within sentences. But not too often or it becomes repetitive.
4: You have to draw out the final word of a sentence occasionally. But not too often or it becomes repetitive.
5: You have to crack your voice occasionally. What do I mean by that? Hard to explain without demonstrating. But again, not too often or it becomes repetitive.
6: Sound a little bit crazy. Do this often.
Are youse crazy or what?