Zomato's Deepinder Goyal's brainwave of providing 'pure veg' meals is a fab showcasing of an unverifiable service. It has inspired us to come up with other such services that purely depend on taking leaps of faith on the customer's part. Selling a 'box of happiness', for instance, shouldn't be too hard if one provides the box with decent wrapping.
That the box would be visibly empty will add to its mystique — indeed, value. Or the other way around — making it suitably expensive can be confirmation that it holds something as expensive as happiness. Then there can be 'brain enhancer' in syrupy form.
Yes, several brands of this 'formula' exist. But nothing really top-notch can be found in the market. While smart folks will happily procure the tonic to become smarter, no one will actually know whether the 'brain enhancer' enhance their brains or their own cranial growth.
'Memory agarbattis' can be another product that 'sends happy thoughts from you to your late loved ones'.