I do this! It's just a silly moment but gets great reactions. And I always carry an extra piece so they can have one that doesn't come out of my mouth 
http://youtu.be/6nVhC_oI7tA
Enjoy!
PS. I do have some methods for a more visual change of the chewed piece to wrapped piece in your mouth, but this is my preferred handling.
http://youtu.be/6nVhC_oI7tA
Enjoy!
PS. I do have some methods for a more visual change of the chewed piece to wrapped piece in your mouth, but this is my preferred handling.