One day, the medicine man was approached by the chief's wife.
She very hesitantly told him about the problem, "Ummm, big chief, he no fart, big pain in stomach."
The medicine man thought a little bit and then went into his hut, from which could be heard many strange sounds. He finally came out and handed her two rather largish pills, "have him take these and see me in the morning."
The next morning she arrives, "big chief still no fart."
He thinks for a couple seconds then goes back inside his hut. Many more strange sounds are heard and he eventually comes back out, with three of the same large pills, "have him take these and see me in the morning."
Next morning, again she arrives, crestfallen, "big chief STILL no fart, hurt big time!"
Slightly upset, he goes back inside his hut. More strange sounds are heard, for over three hours. He finally emerges, carrying four chocolate covered pills, slightly larger than the others. "Have him take these and see me in the morning."
Next morning, the chief's wife, once again, shows up. He exclaims "Now what?!? Those didn't help?"
Her sheepish reply, "Big fart, no chief"
Sorry, had to do it, heh.