And this wasn't a standard bungee jump, the star decided to do it out of a helicopter over the Grand Canyon, watched by his family and friends.
Will shared the moment on his YouTube channel and once he'd made the jump but was still dangling he said: "It goes from pure terror to pure bliss."
Just before the jump he seemed a little nervous, but he soon got into it and blew kisses to the crowd.
His wife Jada Pinkett Smith and his three kids Trey, Jaden and Willow were watching, along with his friend Alfonso Ribeiro, who played Carlton in The Fresh Prince of Bel-Air. Happy 50th to him!