How to cut a glass bottle

How to cut a glass bottle:

Needed:
glass bottles; nail polish remover (acetone); some string; cold water

Glass is sensible to heat and cold, so it can be easily cut using simple resources.
Wrap some string around the bottle in the area to be cut, remove the string and soak it in acetone, then, put the string back in the area to be cut off, over a sink filled with cold water, set the string on fire, gently turning the bottle around, wait till the flame's out and dunk the bottle in the cold water, that's it!