A startup company claims to be developing Hushme, a product that's something like noise-canceling headphones for your mouth. If you need to take a call and there's no privacy available, you whip this thing out...

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...and wrap it around your yap:

The device can reportedly be operated in one of two ways. The first is that it uses noise cancellation to muffle your voice outside of the microphone, so that those around you cannot hear what you are saying. The second operation mode is rather bizarre: You can choose to have the device emit external noises to muffle your voice, choosing from the sound menu below.

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Shockingly the device, or at least the development of the device, appears to be real. The developers appeared at CES this year and are preparing to launch a Kickstarter campaign for it this coming May.