In this tutorial, we learn how to knife someone in the face with film effects & tricks. This effect is mostly done in the camera and not in computer software. First, get two identical knives and a hat you don't mind ruining. Then, remove the blade from one of the knives and fix it to the hat. Once you have the knife set up, put your actors in place. When you do this part, use caution to make sure you don't throw the knife at anyone. Throw this into the air, then take the shot to the person with the hat with a knife on their head. Do the swish with the other actor and then your shot is finished.