Coke Can Pipe
Materials:Coke Can,A Tack(Something that can poke holes in the can)
Warning: The aluminum on a can is much thicker than aluminum foil, but is still quite thin. I do not know if it is as burnable as aluminum foil, so you may use this at your own risk. Experiment with burning it, and tell me your results, I'd like to know. The reason I put this diagram up here, is because it is VERY commonly used, and its very good when you don't have anything else.
How to Make:
Take the can, put it on its side, then turn it so that the mouth is on the bottom side. On the top side of the can, push down an area the size of a bowl with your thumb. You will probably only be able to make a shallow bowl, but that is acceptable, just as long as you have an area you can put weed into. Take a tack or something pointy and poke a few holes in the bowl, so that it acts as a screen for the weed. Make a larger hole in the side of the can for a carb.
Procedure:
Put your finger on the carb, and light the weed up, suck through the mouth of the can. When the chamber inside the can is full, let your finger off the carb to suck all the smoke into your lungs.
This diagram shows what happens:

And this is how it should look in real live:
