by Joe Morfin
The Effect: you have a napkin and roll a fork up in it, but when you open it, it is a knife!!!
The Secret: first take a knife an put it in a completely unfolded towel diagnoly and fold one corner twords the other. now put the fork on top of it and roll it up over itself. now pull the two flaps away from each other and walla! its now a knife!
It would not let me embed the video, so heres the link: http://www.youtube.com/watch?v=Sb18sBu_Xk4
Tip: i recommend not doing this on a hard surface because the fork will make a *CLANK* and the spectator will know somthing is up.