This is a very simple and not that powerful gun made from a capri sun and some tape.
Step 1: Gather Materials
Step 2: Build
First, drink the capri sun. Then, blow the capri sun up with air through the straw. Finally, take a small amount of tape and tape the end of the straw.
Step 3: Firing
Take it outside and jump on it. Or you can take a sewing needle and tape it to the end of the straw.