If you're a physicist by trade, you've got a lot of specialty options. You can go into astrophysics, particle physics, optical physics, relativistic heavy ion physics, ice cream physics.
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Spanish physics professor Manuel Linares recently unveiled his latest entrepreneurial side project, a tutti-frutti flavored ice cream named Xamaleón that changes colors when it's licked. Using his own funds, and recruiting a couple scientist pals, Linares has established a laboratory/ice cream parlor called IceXperience in the beach town of Blanes. Spain. Buy yourself a Xamaleón cone and the color changes from blue to pink and purple as you lick it.
Linares isn't disclosing the specifics about how his ice cream changes color - secret formulas, special recipes and all that - but concedes that the process has to do with both temperature change and specific acids in human saliva. Linares has also revealed that the ice cream requires a little extra boost - a special concoction he calls "the love elixir" is spritzed onto each cone after it's scooped.