The moonwalk is one of those moves most dancers shy away from, if only because Michael Jackson made it so legendary. It was a surprise to witness Rihanna doing it during a concert last week in Hamburg, Germany while sampling MJ's "Wanna Be Startin' Somethin" for her hit "Please Don't Stop the Music." The singer, who is on the last leg of her "Last Girl On Earth" tour, attempted to do the moonwalk, in stiletto boots. Her dancing is causing chatter online. In the Twittersphere, one user said, "She should have stuck to her bedroom mirror so no one could see." This isn't Rihanna's first buzzed about mishap on tour. On Monday, she took a fall during the beginning of a performance at the O2 Arena in London. What do you think? Hit or Miss?