I want one of these:
Ready, aim, shut 'em up.
Those are the instructions for the SpeechJammer, an invention I wrote about for The New York Times Magazine's innovations issue. Aim the SpeechJammer gun at a nearby blabbermouth, and he'll have his voice played back to him with a delay of a few hundred milliseconds. This gums up the brain's cognitive processes and forces him to stop speaking.
C'mon, admit it. There are times you'd like to have one, too.