A man is surviving on an island along with his friend. They have been starving from four days for food. Suddenly, they find a fisherman. The friend goes with the fisherman in order to catch the fish (if they can find any).
The fisherman returns after some time but he is alone and have some salmon that he had prepared. When asked, the fisherman tells him that his best friend fell off the boat and drowned in the water. Starving for so long, he eats the meal while crying for his friend.
After being rescued, he goes to a diner and orders salmon. When he eats his meal, he jumps commit suicide. Why did he do it?
After tasting the salmon, he realized that what he ate on the island was not salmon but probably the flesh of his best friend.