The Forbidden Lego book introduces you to the secret type of free-style building that LEGO’s master builders do when no one else is looking.
Using LEGO bricks in combination with common household materials (from rubber bands and glue to plastic spoons and ping-pong balls) along with some very unorthodox building techniques, you’ll learn to create working models that LEGO would never endorse. Try your hand at a toy gun that shoots LEGO plates, a candy catapult, a high voltage LEGO vehicle, a continuous-fire ping-pong ball launcher, and other useless but incredibly fun inventions. Because sometimes, breaking the rules is what it’s all about.
You can get the book at ThinkGeek for $22.99. Also sold at Amazon and Barnes & Noble.
Here’s a video example of the fully automatic LEGO gun: