Does it exist, and where can I get one?

Anyone know if such a thing as a portable cell-phone jammer exists? Maybe one disguised as a Walkman? OARN*: To the inconsiderate bitch at the grocery store who kept getting in my way while wandering aimlessly, jabbering idiotically on her cellphone -- there is nothing in your life so important that it can't wait for you to get home to call about. * - OARN: On A Related Note.

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