As ringtone sales begin to fall, the mobile content industry searches for something else to sell people. They've tried ringback tones -- which replace the regular ringing noise callers hear with a song -- and even endtones -- snippets of songs to let you know your call has ended. Unsurprisingly, these haven't really sold too well. But brace yourself for an even more useless idea: "push ringers". Push ringers are ringtones that get pushed to your phone by whoever's calling you, meaning they'd get to control the sound your phone makes when you receive a call. While such an idea holds a fascinating potential for abuse, it's hard to imagine very many people willing ceding control of their ringtone to whoever happens to call them. Never mind the technological barriers to the idea, the sociological ones make it bound to fail.