The moment you realize that you like the bottle of a liquor better than what's inside.
In this Instructable, I made a lamp from 2 Glass Bottles.
Almost everything in the lamp was upcycled (apart from the bulb and the bulb socket)
What Was used:
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First I scored a line on 2 bottles.
Then I used candle & Ice technique to split bottle in 2 pieces.
Spin the bottle on top of a candle (so the line is above the flame).
Then cool the line with ice.
Repeat as many times as necessary until the bottle splits in 2 pieces.
Alternatively you can pour hot/cold water on the line or put the bottle in hot water and then in ice bath.
I personally prefer candle and ice, so that's how I did it.