Life at the shop is not always business. Here, Andy has filled a vise-mounted canister up with gas from the blowtorch, and is using the lit torch to ignite the gas. The canister has an opening at the top, with a ping-pong ball stuffed in it. If you get the proportion of gas to air just right, you can cause the ping-pong ball to explode instead of merely shooting across the room. Fun times!