Mostly intended as a joke, the "Blotto Box" was a theoretical device that would send too much electricity over phone lines, making it impossible for any calls to get through. Depending on who you ask, the Blotto Box is either impossible or would kill you when you turned it on. The intended effect is that every phone would "ring and ring and ring" in an entire area code.
Blue box, red box, blotto box: schematics for many small devices were distributed during the era of telephone phreaking, but not all of them worked as advertised.
by Bitwise February 19, 2007