From I was taught circuit bending is taking electronic devices that make multiple sounds and wiring in switches to set off glitches, or loops. This was my first project with soldering and it makes a great first project. Check the end of the instructable for a video.
Step 1: Gather Materials and Tools
VTech Talking Little Smart Spelling Book
a switch (not necessary but makes things more fun)
Dremel (if you want to make a hole in your electronic for the switch)
I wasn't sure if this would be a tool or a material so it gets its own category.