Slit throat effect

1) Make fake blood

2) Buy a very thin plastic icepack or a water balloon.

3) Fill the icepack or the water balloon with the artificial blood.

4) Put an inch thick bandages around the victims neck and throat.

5) Tape the thin icepack or water balloon against the thick bandages.

6) Get some plastic foil and surround the victims throat and neck as tight and smooth as possible, though not so much the victim actually suffocates.

7) Use "skin colored" spray and makeup to make the neck and throat realistic.

8) Get a medium sharp knife and slit the throat clean, but just right at the tip of the balloon or icepack; the bandages are so you don't hit the actual throat

Found off: http://www.wikihow.com/Make-a-Horror-Scene-With-a-Slit-Throat