Jaime Almarza Quezada, AKA "Bullet Man" the Human Cannonball, was performing at a circus in Chile when he overshot his safety net and crashed into the crowd. According to one report, he hit a clown who was knocked to the ground, but not hurt.
The cannonball did guy survive, but was busted up pretty badly with a fractured chin and knees. Luis Alvarez, who operated the cannon, took the blame for the accident. He didn't disconnect a pressure hose before launching Quezada, causing the cannon to build higher pressure than usual.