I've come across this site before, but happened upon it again today. If you've never been to How to do Stuff, you've got to check it out. I just read through every article. Unfortunately, they haven't posted any new ones in a few years, but the stuff that's there is golden. They've even inspired me to go pick up a copy of the Anarchist Cookbook. If you don't read through the entire website, you've got to at least look at a few of my favorites.
How to Make a Sideways Room
If you had the time and energy to do this, I can't begin to tell you how awesome you would be.
How to Make a Flamethrower
Because honestly, who doesn't want their own home-made flamethrower laying around the house?
How to Force an Elevator to go Straight to Your Floor Without Picking Anyone Else Up
I would have loved to try this one out when I used to work in the Union Building at IUPUI. Luke, be sure to let me know if it works.