Following the advice of the great Bob Marley we can, for about $25, buy a device that jams annoying mobile calls. Click the switch and it sends out a blast of radio waves that stops the call. This has become something of a sport with jamming commuters. They wait until the caller gets through and jam it just one sentence into the conversation. "Wicked man.....CLICK, "Off to Tuscany tomorrow...CLICK. Wonderful!
On Bluetooth, I think it should be made legal to hit anyone wearing said device on the head, with a baseball bat. You might as well tattoo 'I'M A TOTAL PRAT' on your forehead. Note, of course, that this picture shows something you never see in real life - a woman wearing the device - never happens, they're far too sensible.