Upwell is a small studio with a new product: a multifunctional light switch. In order to gauge the popularity of its new 'Walhub,' Upwell installed a bunch of the switches at IKEA to see if they'd get any interest. The studio had a man walk into the store in virtually the same kind of yellow IKEA shirts the employees were wearing and drop of stacks of the product throughout the store.
When people brought the Walhubs to the cash with the intention of purchasing them, this caused confusion amongst the staff, especially since customers described that there were "stacks" of the items on the shelves.
Clearly, this funny prank proves that there is a definite market of people who want to buy Upwell's Walhub.