In this Dec. 13, 2017, file photo, Will Smith arrives at the U.S. premiere of "Bright" in Los Angeles. When Smith turns 50 on Tuesday, Sept. 25, 2018, he will jump head-first into the big milestone. The “Fresh Prince” plans to bungee jump from a helicopter over a gorge just outside Grand Canyon National Park. His birthday activity is the latest in a vast history of outrageous stunts staged in and around one of the world’s seven natural wonders. (Photo by Jordan Strauss/Invision/AP, File)