One day a farmer met an Alien when he went out. The Alien showed three fingers to the farmer, then the farmer replied him by giving him five fingers. And the Alien make the hand gesture of number eight, the farmer handed up his thumb to the Alien for appreciation.
After the farmer came home, the farmer told his wife that he had met a very clever Alien who knew three and five was eight . And the Alien told his wife with horror that he met a cruel terran who said himself can kill five terran everyday while the alien said he can kill three. The Alien said he killed them by shot, but the terran said he killed the human with his thumb.