Answer:
What is at the end of a rainbow?
The line a runner strives to reach
Where is the ocean deepest?
What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
What did the piece of wood say when he saw the screwdriver and screws approaching?