Decided to practice my bottle cutting abilities. If you are trying to do this yourself here are the directions:. -First, never aim bottle or swing knife toward a person. |--| -Chill the head of bottle in ice for 10 min. |--| -Find the ridge (seam) of the bottle and hold the bottle in non-knife hand slightly upwards. |--| -Swing through along the bottle till you hit the neck, the neck will snap off. I recommend using the non-sharpened side of the knife to prevent dulling..