Now this is a story all about how Alfonso Ribeiro's frown got flipped, turned upside down.

After hitting a disappointing shot at the American Century Celebrity Golf Tournament in Lake Tahoe, Nevada, on Friday, Ribeiro seemed like he needed some encouragement -- so Justin Timberlake and the crowd started cheering him on. Soon after, the actor launched into his famous Carlton dance and Timberlake joined in on the fun.

Ribeiro also broke out the dance to help win "Dancing with the Stars " late last year, but all that was planned. This was totally spontaneous and amazing. Plus, JT was there, too. It's like he's a mirror. His mirror staring back at him.

Anyway, if you like to take a minute, just sit right there, and watch Ribeiro and Timberlake do the dance from "Fresh Prince of Bel-Air ."

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