Fun Riddles

Question: This is this puzzle. This is is puzzle. This is how puzzle. This is to puzzle. This is keep puzzle. This is someone puzzle. This is busy puzzle. This is for puzzle. This is forty puzzle. This is seconds puzzle.

Question: A man entered a house. There was no one else in the house. He walked in to a room, stopped, and slowly raised his hands above his head. After a moment, he turned around, let out a laugh, and left. Why?

Question: i have a house but it doesnt have a door?

Question: What season is it when you are on a trampoline?

Question: Which book will never be written?