Hard situation puzzles

One day a man received a parcel in the post. Carefully packed inside was a human arm. He examined it, repacked it and then sent it on to another man. The second man also carefully examined the arm before taking it to the woods and burying it. Why did they do this?

Aborigines lived on an island in the middle of the ocean. However, they found a way to get rich. How did they do it?

Two women are talking. One goes into the bathroom, comes out five minutes later, and kills the other.