“Robot Couple” is the nickname given by locals in Yiwu, China, to a married couple who run their restaurant 21 hours a day, from 6 a.m. to 3 a.m. In fact, there is more than just one couple. The trick is that there are two identical twin men married to identical twin women. They work different hours to keep the restaurant open as long as possible, but most customers think that there is one super-couple that never sleeps. The truth only came out when one of the twins gave an interview to Today Morning Post.

adapted from http://listverse.com