Take a look at the stuff located under the right hand col. under Related.
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Take your pick from these search results. Pay particular attention to Plasmana's projects.
You get a digital recorder and shout #$*/&(%$#@!?! into it, then play it back somewhere where everyone is being serious.
You mean like for an electric fence, or a cattle prod, or ECT, or a novelty prank item, or what?