How to Get Frat Boys to Go Green

And shower, too:

Take 66 beer bottles. Fill them with water and connect so that it flows slowly from bottle to bottle. Place apparatus on roof (or better yet, build it in place) and voila, you have the ultimate in DIY solar thermal hot water systems. Not only do you get the pleasure of consuming 66 bottles of beer on the way, you also get the joy of providing hot water for your mother to shower in comfort.