Weasleys' Wizard Wheezes is a joke shop located in Diagon Alley, founded by the twin brothers Fred and George Weasley from the Harry Potter series. The shop specializes in magical pranks, joke items, and novelty products, attracting a wide range of customers, including students and adults. The shop offers a variety of unique products, such as Skiving Snackboxes, which cause temporary illnesses, and Peruvian Instant Darkness Powder, which creates instant darkness. Weasleys' Wizard Wheezes became popular for its creativity and humor, contributing to the Weasley family's legacy in the wizarding world.