This is a fun and extremely simple way to get someone to believe you can crack your nose!
cover your nose with your two hands. Have your index fingers sitting on the bridge of you nose.
Secretly place on of your thumbs under your top front teeth.
Now it is time to stun your audience.
With your thumb still under your front top teeth, slide it back and forth to create a cracking sort of noise. While doing this make a face that will convince the audience that this may be a bit painful!