In 1958, a curious sight began appearing on the sidewalks of California. People were taking apart roller skates, attaching them to the underside of wooden planks, sometimes boxes, and whizzing down the streets.

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One of the most famous folklore in marketing and data mining goes like this: many years ago, Walmart noticed that on Fridays, men would head to the store, pick up some diapers for their babies and grab a six-pack at the same time. To take advantage of this, Walmart placed the diaper and beer aisles adjacent to each other, resulting in skyrocketing sales for both items.

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Have you ever gone to an e-commerce website with the intention of buying one specific thing, but then ended up with something totally different?

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