The contractor may be Aaron Burr

An apartment complex in Pomona promises a window upgrade that sounds needlessly aggressive. I've heard of window valances, but window violences?
(Aaron Burr's infliction of pain during a duel with Alexander Hamilton can be studied here.)

A journalist for more than two decades, David Allen has been writing a column for the 

Got Milk
My apologies, I couldn't resist...
Who says chivalry is dead?
When you open the door, the contractor slaps you with a glove.
I could've sworn this was on Chief Second Street!
Need directions? Take ten paces and make a U-turn.
For the Mac and other alternative OS users out there:
The whole exercise is moot. The pain one endures when dueling with Windows is immeasurable.
Even if "dual" was to be the correct spelling, what about the "hurt glass" meaning of "pain windows"? Was this a warning for birds to stay clear of them? And students ask "when will I ever need [insert school lesson here]...?"