A weaver and his wife lived in a village. He went to the forest to get wood that he needed to repair his loom. As he began to chop the tree, a djinn appeared and asked him not to cut his abode. 

 In return, the genie offered to give anything that the weaver wanted. The weaver left the forest to discuss this with his wife. The greedy and dimwitted wife told the weaver to ask the genie for an extra head and two extra hands so he can think more and work more.
The stupid weaver agreed and went back to the djinn, which immediately granted the wish. The weaver happily walked back to the village, where people thought him to be a monster and beat him to death.
Moral: Lack of proper judgment can lead to several missed opportunities.