The following pics are from DEC customers. In most cases the problems are caused by aging breaker panels or crimp connections behind receptacles.  In most cases customers knew of the problems before hand, but delayed service until the fire department left........and they were in the dark!

Burned panel due to overheated alum-copper  connection

Outlet zapped by power surge

Outlet burned due to copper-aluminum  connection overheating

Dryer connection overheated by poor wire connection

Burned breakers due to overheating of old panel 

Burned connections in old panel