1) Penguin Problem: One day a girl cooked a dish for a boy. The boy finished eating it, but felt the taste was strange, so he asked the girl, 'What kind of meat is this?' The girl said, 'This is penguin meat.' The boy thought for a while... then burst into tears and committed suicide. Why?
2) Train Jumping Problem: A person takes a train to a town to see a doctor. After the visit, he is fully cured. On the way back, the train passes through a tunnel, and the person jumps off and commits suicide. Why?
3) Aquatic Plants Problem: A man and his girlfriend were taking a walk by the river when his girlfriend suddenly fell in. The man rushed into the river to search for her but could not find her, so he left sadly. Several years later, he revisited the same place and saw an old man fishing. But the fish the old man caught had no water plants on them. He asked the old man why the fish had no water plants on them, and the old man said, 'You don't know, this river never had water plants.' Hearing this, the man suddenly jumped into the water and committed suicide. Why?
4) Funeral Story Problem: There are three women: a mother and two daughters. The mother dies, and the two sisters attend the funeral. At the funeral, the younger sister meets a handsome man and falls in love at first sight. But after the funeral, the man disappears and cannot be found. One month later, the younger sister kills her older sister. Why?
5) Grassroots Matchstick Problem: A person is found dead in the desert, head down, with several suitcases scattered around, and the person tightly holding half a matchstick in their hand. How did this person die?
6) Sawdust Problem: In a circus, there are two dwarfs. The blind dwarf is shorter than the other dwarf. The circus only needs one dwarf, and of course, the shorter the better. The two dwarfs decide to see who is shorter; the taller one will commit suicide. But the day before the height comparison, the blind dwarf, who is the shorter dwarf, has already committed suicide at home. Only wooden furniture and sawdust were found. Why did he commit suicide?
7) Midnight Knock Problem: A person lives in a small house on a mountaintop. In the middle of the night, he hears a knocking sound at the door. When he opens it, no one is there. He goes back to sleep, but soon hears knocking again. When he opens the door, still no one. This repeats several times.The next day, someone found a dead body at the foot of the mountain, and the police came to take the person at the top of the mountain away. Why?
