At I/O, Google had a cute — and terrifying — demo where an AR 3D shark was placed right on the stage. It didn't take much; a simple search for the word "shark," a couple of taps, and the spine-chilling animal was just there swinging left to right, grinning with his clean white teeth on show. You can have that same experience now as the feature is going live for users. I recommend playing the Jaws theme song while you're testing it, for maximum effect.

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