Okay, so on another thread we are discussing alternative uses for items that can help us survive, what we've referred to in the past as "MacGyverisms".

So the zen of our art, then is not only about knowing what works, but also about making what is available work to our benefit. Given the vast knowledge and creative talents of our group, maybe we could list off some alternative uses for everyday things that others might not realize. This could be big so let's limit each post to one or two really good citations eh?

Mine are:

Using a CD/DVD as a reflector/signaling device, and

Making a cutting tool by breaking glass.

Okay, who's next?