How to saber a bottle of champagne - Remove wire cage from cork. Hold bottle in a napkin for your protection should things go horribly wrong, with the bottle seam facing up. Then, using a heavy knife (if it's a good knife you can use the back of the blade), run the blade along the seam into the lip at the neck of the bottle. Do this with conviction, and pop, there goes the cork (with the neck of the bottle still attached). Be careful with the top of the bottle - it is extremely sharp, and if you play with it too much you might end up pouring rose.
Essentially all you are doing is cracking the neck of the bottle, and the pressure does the rest. It's not a chop or a decapitation or anything.
BTW, you can also saber still wine. Saber the bottle once, and then with a towel remove the broken off ring of the bottle. The cork will still be in the bottle. Then with a pair of pliars or a nutcracker or something, take out the cork.
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