Manhole explosion from sparklers - GIF

Sidewalk explodes after kid drops sparklers down a manhole.

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Previously:

https://www.homemadetools.net/forum/...083#post125701
https://www.homemadetools.net/forum/...871#post129275
https://www.homemadetools.net/forum/...907#post102827
https://www.homemadetools.net/forum/...734#post124027
https://www.homemadetools.net/forum/...229#post101052
https://www.homemadetools.net/forum/...737#post102333

Just a bit of methane. I bet he won't do that again!

I am thinking that he knew very well what would happen when he did that. Why else would be drop a sparkler down the hole?