Carving pumpkins is fun, but exploding pumpkins is even funner! While there are lots of ways to explode a single pumpkin, getting many to explode in unison was challenging. This demonstration uses chemicals that create a flammable (acetylene) gas.? After much experimenting, I was able to use one exploding pumpkin to trigger the one next to it creating a spectacular chain reaction. This remains one of my favorite Jimmy Kimmel Live demonstrations.