How do I change the the voices of people in videos?

I have to make a video for a project I'm working on in school, and I would like to know how you change your voice once you upload the videos onto the computer (kind of like Fred). I want to make my video as entertaining as possible for a good grade. Help please?
How do I change the the voices of people in videos?
There is probably some video-editing software that you can buy that allows you to do this, but what I would do is search google for an mp3 extractor. Then extract the mp3 from the video. Then get audacity and mess with the sound file however you want. Then merge it back with the video.

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