Answer:
A white field, and when it is plowed, its soil is black.
Why was the person shocked?
What comes once in a minute, twice in a moment, but never in an hour?
There are two monkeys on a tree and one jumps off. Why does the other monkey jump too?
It is a place of play on a sunny day. Winter will come and take all the fun, but we'll be back in May. What is it?
What did the piece of wood say when he saw the screwdriver and screws approaching?