Under settings, open "General". (Settings > General)

Now open "Accessibility". (Settings > General > Accessibility)

Locate the option "White on Black" and slide the switch to the ON position.

If completed correctly your screen should look like this.

For some extra fun, locate the "Triple-click Home" option, located at the bottom of the "Accessibility" menu. Click the picture ABOVE for a preview.

Choose the option "Toggle White on Black". To activate this feature, simply click the HOME button on the iPhone 3 times.

Unfortunately, the iPhone will not allow me to screen capture any images while displayed as negatives. Any screen capture taken when this feature is active reverts back to a normal photo.

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How to freak out an iphone user.

Freak Out an iPhone User.