Human cannonball David "The Bullet" Smith's 64-year-old father is filling in for his son and thrilling audiences in Franklin, Tenn., this week.

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The younger Smith injured his back Saturday at the Williamson (Tenn.) County Fair, the Nashville Tennessean reported Tuesday.

"What happened was right during the countdown, I stiffened my body like I'm suppose to and my back went into a spasm, like a cramp," he said. "It twisted and the cannon fired on me. I was kind of lucky with my flight ... I didn't have to do much with adjustments."

Luckily, he landed in his net and didn't break any bones.

Until he's medically cleared to fly again, Campbell said his father and mentor -- David "Cannonball" Smith Sr. -- will return to the family business and be shot 150 across the fairgrounds into a net.

"This is how I got in the cannon business," the younger Smith told the Tennessean. "My dad pulled his back and asked me to come and fill in for him."