. . .  we did so in the most
expeditious and least cost
way

. . .  and in doing so,
occasionally we
inadvertently ran
our pipes through
sewer lines.
 
Consequently, if you need
to clear a blocked sewer
line, please do not use
a conventional rotating,
root-cutting sewer-line
tool as it could damage
the gas line and cause a
highly explosive gas leak.
 

--	Your local natural gas supplier monopoly.