Back in the late 70's early 80's, there was a bit of a craze for CB radio. From a legal standpoint the afficianados were supposedly only allowed to use FM rigs. An awful lot of participants, however, were using "illegal" (very powerful) AM setups - with the upshot being that whislt sitting at home, quietly listening to a piece of music, I would, quite often, be suddenly (and rudely) interrupted by a...

BIG BEN, THIS IS RUBBER DUCK. . . or some such verbage.

Transpired that my speaker leads were just perfect for acting an an aerial.