MouthSounds

If you want to be the envy of the under-10 crowd, there's nothing you can do that will impress them more than pick up a copy of MouthSounds and get to practicing your boings, pops, whistles and bonks. This book teaches you techniques to create hundreds of sound effects using just your mouth, from a bubbling aquarium to a crashing car to a taxi whistle. The included CD contains recordings of all the sounds so you know just what to do. $11.16 USD. (Via Cool Tools.)