You might not be able to envision a time when you're lathe-less and need to cut a glass bottle in two. However, when it does happen, you'll be quite happy you spent three minutes watching 'CrazyRussianHacker' do it with string, alcohol, fire and water. And even if you don't ever cut your own glass, this hack is still incredibly fun to watch.
Like a modern day mullet-less MacGyver, our Russian friend pulls off the seemingly impossible using nothing but household materials, leaving him with two halves of a bottle perfect for... Well it's still pretty neat to watch, and it presumably would come in handy for aspiring jewel thieves as well. [YouTube via The Awesomer]