It was one of those "Hey, watch this!" moments.
He shoved a potato(e?) into the end of the barrel and rammed it home with a stick.
He then unscrewed a cap beneath the barrel, sprayed a three-second spritz of hair spray into that compartment, then replaced the cap.
He shouldered the contraption, pulled the trigger, and sent the spud hurtling more than a football field's distance.
I was stunned.
I couldn't help myself... uncontrolled laughing followed.
We then proceeded to use up a $2 can of hairspray and send a $5 bag of potato(e?)s downrange in less than 10 minutes, giggling all the while.
Not really a toy, the potato slug leaves the barrel at a rate that would probably kill a nearby person struck in the chest by the projectile.
Ever fire one? It's a hoot.
I recommend it.
I bet it puts a smile on your face.
But as with most anything that fires a projectile, be careful!
Detailed construction plans for one type here.