There's a big credit company that sends me regular mailings trying to give me credit.
So many people I know have been screwed over by this company and it's slime-ball tactics that I get a little mad everytime I see their mailings (especially since I gave money to some of these people to get clear of them...only to have more bogus service charges piled on...and my money was just sucked into a void never to be seen again, and did no good for anyone)
So, to make myself feel better, I put a little note to the effect of:
I just wanted to drop you a little note to let you know that I know a number of you customers, and I've observed how you treat them.
Until you change your business practices, I believe that I would rather jam white-hot pokers into my eye-balls than do business with you.
Just so you know.
Then I send it back to them in their business reply envelope. Sometimes, I just send the envelope back empty, if I am pressed for time.
Petty? Usless? A waste of time? Sure...
But people do all sorts of petty, stupid unproductive things to waste their time.
Some people watch Sex in the City...I send back snarky notes in the business reply envelopes. It takes less time, and it gets me outside to walk to the mailbox.