In case you lack inspiration, this is why flash exists:
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I could imagine how much better this would be on drugs. Zombie might wanna take a whack at it and tell us about that later.
For messing with voices, you can do a few interesting things with Audacity. If I had a mic and something to plug it in to my computer with, I'd do voice acting. But, alas, I am incapable. If only you could download microphones off of Kazaa..
With Audacity, you could make someone's voice recording super fast, super slow, high pitched, low pitches, echoed, and a few other interesting effects. Fun for messing with mp3s, too.
[Edit: Fixed url tags.]