I love building ringtones and text-tones for my iPhone, and assigning them to particular individuals, based on their personalities. There's lots of articles out there on how to build them, but here's my collection for you to enjoy. Simply download the file, double click to open it in iTunes, and sync them in the Tones tab of your next iPhone sync.
Prince - Pussy Control
Napoleon Dynamite - "Sweet!"
Michael Scott from The Office Declares Bankruptcy
The Cliffs Of Insanity! From The Princess Bride
Kung Fu Fighting
You Sexy Thing by Hot Chocolate
Borat says, Ooh-la-la, Wawaweewa