Lateral thinking puzzles (or riddles)

 

In each case below, a scenario is given but without explanation and the challenge is to provide that explanation. The idea is not that you try and guess the answers. Rather, the idea is that you look at the answer and then ask one of your family or friends to guess. Before guessing, they ask you questions about the puzzle, to which you may answer only with 'yes', 'no' or 'doesn't matter' and then, when either you or they get bored doing this, they guess.

Scenario Explanation
A woman has incontrovertible proof in court that her husband was murdered by her sister. The judge declares, “This is the strangest case I’ve ever seen. Though it’s a cut-and-dried case, this woman cannot be punished. The sisters are Siamese twins.
There are a carrot, a pile of pebbles and a pipe lying together in the middle of a field. They are the remains of a melted snowman.
A man receives a package, opens it, looks at its contents, and sends it to another man. The second man opens it, looks at its contents, is satisfied and then buries it. Three men got shipwrecked and had to spend several weeks in a lifeboat. One of the men was a doctor. After their food ran out, and they were desperate, they decided to have the doctor amputate their arms so they could have something to eat… but of course, he couldn’t amputate his own arm, and they weren’t so keen on letting him get away scot free. They came to an agreement: they would remove and eat one arm from each person besides the doctor, as long as he agreed to have his own arm removed when they were rescued. It was the doctor’s arm in the package; he sent it to both of the others so they could verify that he held up his end of the deal.
A man is dead in a room with a small pile of wood chips and sawdust under his bed. A second man looks in through the window and is pleased. The man is a blind dwarf, the shortest man in the world. Another dwarf, who is the second shortest man in the world, has been sawing small pieces off the other's cane every night. When the first dwarf picks up his cane each morning, it appears to him that he's grown a bit taller. Since his only income is from being the world's shortest man, and he thinks that he is growing taller, he decides to kill himself. The second dwarf then becomes the shortest man in the world.