Astronaut John Young, while on the surface of the moon, had attempted a long jump as part of the "Lunar Olympics" that basically just involved them fucking around and testing their abilities in Lunar Gravity, but the physics of microgravity were still not that well understood yet, and as a result, he landed directly on his back, where his suits life support systems were, and because mass still carries momentum even in low gravity, it was still a fairly hard fall. He later recalled in his book that he felt panic, "The thought that I'd die raced across my mind. It was the only time in our whole lunar stay that I had a real moment of panic and thought I had killed myself. The suit and backpack weren't designed to support a 4-foot fall."
He also later said that he thought the last thing he'd ever see was the Earth itself as he was facing the Lunar sky, 238,000 miles from home in the cold dead vacuum of space.