There are two ways to make a good paper popper that I am aware of. This Instructable will show you how to make both. Out of a piece of paper you can make a big pop that scares the people around you. This is great in school if your teachers don't care or you don't care to get in trouble.
To make both of them you need to get paper, The lighter the paper the louder the pop, but sooner the rip. I suggest using notebook paper, it works great.
1- a notebook of paper(really only need two pieces)