Watch what you walk over.

[Flames erupted through paving slabs
on a London pavement as commuters
made their way to work on Monday
morning, cause firefighters to
evacuate 50 people from the area.
The explosion came from a fault under
an electrical manhole cover outside
a branch of Iceland on Caledonian Road
in Islington, according to the Islington Gazette.
Power was out for local businesses
and roads were closed until around 10am. ]
http://www.huffingtonpost.co.uk/2014...n_4802211.html