You will need:
1. An empty CD box
2. 3-5 Paperclips
3. Some wires
4. 1/4" jack/adapter with cable
5. Duck tape
6. Plasticine cat to oversee you activities
Step 1: Attach paper clips to make it bouncy
2 .Put a bent paper clip inside, as shown.
3. Tape it to the box with duck tape.
Now if you try to close it, it will bounce back, like a pedal. The problem is that it will snap closed if you press hard enough. We resolve this problem in the next step.