How do people change there voice to sound like another person (like a celebrity)?

i know people that never went to school for this an know how to sound like Arnold swhaudfsdffhje(the terminator lol), bernie mac.. etc Whats the trick? how do yo do it?How do people change there voice to sound like another person (like a celebrity)?
lol if I watch enough Laguna Beach I start to sound like Kristin. if I watch enough The Hills I sound like LC.



I don't do it on purpose...I just pick up on their tone and sayings....How do people change there voice to sound like another person (like a celebrity)?
http://www.celebritymoviearchi

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