Good Riddles

Question: When you close it, you see mysterious and funny looking images. But if you open it, the mysterious images are gone. What Am I?

Question: You are in a jungle and you come across a lion and a jaguar. You have a gun but there is only one bullet left. Which one do you shoot?

Question: I grow from trees and your home,
once I am grown I fall to my doom.

What am I?

Question: A man is found murdered on the ground with 53 bicycles scattered around the room.

How did he die?

Question: You have two books. One of them is upside-down and the other is rotated so the top of the book is facing you.

What is the sum of the first page in each book?