Cheap optics is a great worst buy... but my funniest and most appropriate end was a "Solar Shower". Supposedly you hang these deals in the sun and you have a nice warm shower. Well, I hung mine, I laid it on the hood of a vehicle for 3 days and finally found out how it works best. The last night when we were ready for bed I threw it on the fire, telling my buddy I figured out how this works. It did heat the water, it burned up the damn thing and put out the fire for the night so the ranger wouldn't get mad. LOL I vote solar shower.