So you want to dominate future snowball fights? You may want to build your own snowball machine gun. This video, shared by Mark Rober, shows a machine gun that can fire 13 snowballs in .5 seconds. A landscaping leaf blower was used to start this project. The below video shows how it all works:
Simply load the magazine with 15 snowballs and clip it on. The trigger lets you control the airflow. You can also control the rate of fire. More instructions are available here. What do you think? Are you impressed?