What is on your bed?
A box is on my bed.
What is in the box?
A boat is in the box.
What is in the boat?
A bus is in the boat.
What is in the bus?
A bike is in the bus.
What is on the bike?
A basket is on the bike?
What is in the basket?
Bread is in the basket.
What is on the bread?
A book is on the bread.
What is in the book?
A billion balloons.