Jellyfish (and their relatives) can glow in the dark because they produce proteins that release photons when they get bumped. You can experience this if you've ever gone swimming in the ocean at night: splashing in the water causes whatever plankton you've bothered to vividly glow. It's possible to extract these magic proteins into a form that you can then sell on the Internet, where anyone can buy them and use them to make ice cream that glows when you lick it. It may be safe (emphasis on "may"), but it's certainly not cheap, at about $225 a scoop.
Next, they're working up some invisible ice cream, a picture of which we actually snuck into yesterday's Image of the Day.
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