Step 1 - Grab a beer bottle preferably with thick glass such as corona bottles. Tie a string just above the label on the empty bottle. Step 2 - Keep the string tied and soak it in lighter fluid. Step 3 - Put the string back on the bottle and hold it horizontally. Light the sting rotating the bottle so the flame spreads. Step 4 - After you hear the crack, pour cold water on the string and the top of the bottle will fall off. Step 5 - Now grab sandpaper and sand the edges of the bottle till it is smooth.