Yet another advantage of practicing safe sex: if you're lost in the wilderness and you need to start a fire, use a condom filled with water! Take a clear condom (opaque condoms become clear when stretched), wrap the end over a water bottle and squeeze the water in. The sphere becomes a lens, which you hold a few inches above your tinder. The next time someone catches you with condoms in your pocket, just say "I was going hiking." Apparently the same will work with balloons and latex gloves, although those aren't as much fun to have around. Question: if you don't have any water bottles handy, can you fill it with pee? Gross, yes, but perhaps it would work...

Via Sexoteric, a Not Safe For Work (NSFW) site.