Every so often a dance craze sweeps the country, and the 19th century was no different. By the 1840s, the polka, a fast-paced Bohemian groove, dominated the dance floors of Europe and the United States. Savvy marketers capitalized on the fad by adding the word "polka" to merchandise that had nothing to do with the dance. Born from this idea was the polka hat, polka gauze and, of course, the polka dot, which ultimately outlasted the trend. Thankfully, while the 20th century saw its fair share of new moves, macarena-wear never caught on.