The dude in the linked article tried to launch a rocket from his back door. I bet he was bummed out when the firecrackers in his crack blew up. He will now be the butt of many a joke. Pucker up, pal.
"And also the body naturally produces methane gas, so combine that with the firework and the exploding effect with methane's flammability - it certainly could have been a lot worse than it really was."