Here's a lazy link to videos of people attempting sabrage, which is opening your champagne with a sabre - or other blade. I haven't looked at the clips yet, but they could prove a refreshing accompaniment to your next tea-break &c. If you're inspired to try it, at least I've given you enough time to practise before next New Year's Eve. Also plenty of time to hire an appropriately magnificent military uniform if you're going for the sabre option. No point in doing something so ludicrously ostentatious unless you're going to go the whole hog.