the sound of silence: kerrching!!

Last night I saw an ad on telly from one of those mobile ringtone companies. This time it was advertising a silent ringtone. Yeah, silent. They said, it rings at a frequency most people can't hear! They said, get the ringtone now and see if you and your friends and family can hear it! Damn clever marketing, doncha think? It's so clever I think I might just have to adapt it for my own money-making purposes. So, available for purchase right now, my very first novel...printed in invisible words! Buy now and see if you can read it!
I guess the kind of people who would buy a silent mobile ringtone are the kind of people who would buy an air guitar.