This is a low to no cost project. This is a binder clip catupult that launches coins.
Step 1: Materials
This is a list of the materials.
Pencil (pen will work too)
Step 2: Rubber Band
Now, wrap the rubber bband around the metal clamps like this.
Step 3: Pencil
Now, take the biner clip and open it up just enough to slide the pencil in. It should look like this.
This is the final product. Please do not aim at people. I am not responsible for any injuries.