The gun was made from potatoes???
Same thing, only different!
An unnamed crew working out of a secret location, made a high pressure potato gun.
Led by an mystery engineer, using a pneumatically actuated valve with a pre valve reservoir,a tank of dry nitrogen and copper tubing.
Waiting until after normal business hours , they test fired.
The projectiles were NEVER found!!!
I think, you know all the co conspirators, and the guilty need to remain nameless.