Why did rob yell Geronimo after his parachute opened?

Rob yelled "Geronimo" after his parachute opened as a playful expression of excitement and exhilaration, a tradition often associated with skydiving. The phrase is rooted in the idea of embracing the thrill of jumping, symbolizing bravery and adventure. Additionally, it reflects a sense of camaraderie among jumpers, often used to lighten the mood during the adrenaline rush of freefall.