Ping Pong balls are not filled with flammable gas, but you might think that they are from how intensely they burn. It’s actually that they are made of celluloid, which is highly flammable (the gas inside is just normal air). Light one on fire and it burns intensely for a few seconds. Even that is surprising and eye-catching. Light 1,000 ping pong balls on fire, and, umm…wow.
And when it’s all done: nothing. Just a little bit of ash. You would never know that just moments before there were 1,000 ping pong balls, and then a giant conflagration.