This is a simple but high powered gun.
Step 1: Materials
1x Drinking Straw
1x Bamboo Skewer
1x Balloon (I had a water balloon)
Step 2: Body
Put a decent amount of glue on the straw about where I have my finger to the bottom.
Step 3: Trigger
Slide neck of the balloon to the top of the glue and squeeze tightly to get it to stick well to the straw. Leave to dry for a couple of hours for maximum strength.
Step 4: Ammunition
Slide the skewer into the straw.
Step 5: Fire!
Pull back on the balloon and fire!
Note: If the balloon comes unstuck just glue it back on.
CAUTION: Do not fire at anyone!