2. No seas maje, maje! (don´t be a fool, dude! This is my favorite)
The knife is held loosely with the blade facing down, between the base of the thumb and next to the knuckle. It is then brought near the face of the subject and "flicked" at them, to give a light cut.
It will not do much damage but will show that the user could do a lot more to the subject.