Answer:
You draw a line. Without touching it, how do you make the line longer?
What can fill an entire room without taking up any space?
A traveller moved from North to East then to West and lastly South.. What was he looking for?
A man is twenty years old but has only had five birthdays. How is that possible?
How can you place a pencil on the floor so that no one can jump over it?
It is something you will never see again.