Small towns are great for this kinda shite.
I loved my PVC tennis ball / potato cannon till the Girlfriend got really paranoid. One of our dogs would hide under the bed with his *** pushed into the rear wall and come out visibly shaking for 15 minutes every time I fired it nearby.
I built it with a barbecue igniter (scavenged from Craigslist free barbeques - people would hate when I arrived and just yanked the igniter and left)
I built it with the igniter so I did not have to use the lighter at the bottom hole all the time. Just press the piezio electronic barbeque button and BOOM! I wanted to upgrade to butane injection , but that was a no go with the Girlfriend. Uggh