A couple in a car get quite a scare when a manhole explodes in the lane next to them

Nothing like driving past an exploding manhole one lane over to get the adrenaline juices flowing.

And what causes such eruptions?

In the YouTube comments, the person who posted this video said a city worker thought an electrical explosion might have been the culprit, pointing out that power had gone out in the area, while a commenter suggested it could have been caused by "gas in the pipes."

Looks like they both might be right. This article blames the combination of electricity and gas for manholes that suddenly go berserk.