Reminds me of some other crazy ways people use to pass the time. At rallies, Bikies are fond of 'recycling' empty Stone's Green Ginger Wine bottles. Only problem is it involves the hot coals of a campfire, one sample of said bottle with cap partially screwed on and some petrol.
Wooosssshhhka.....
Disclaimer: Don't try this at home kids. Very dangerous activity. I was at a rally where one very drunk bloke fell into the hot coals of a bonfire. He went to hospital with burnt hands and wrists. He was bandaged up and returned to the rally to drink some more. 
Astronomy is a much more relaxed way to spend my weekends.