I know, it sounds like I made up the story in the title above, but this is exactly what happened the other day at the circus in Chile.
They had arrived at the Human Cannonball part of the show and the cannon was backed with a little too much oomph on this particular day. The cannon goes off and the human cannonball goes flying over and beyond the safety net that usually catches him. Unfortunately, just beyond the next was the crowd and for some reason a lone clown who took the brunt of the landing.
The clown was knocked down but uninjured while the human cannonball guy suffered broken bones including a fractured chin and knees.
If you'd like to, check out the video below...