I worked in the photo finishing business for a dozen years. One of the worst customers was a self proclaimed "Professional Photogragher". He came in with a 8x12 photo and wanted a copy for a cliet. I asked him for the negative.
"Oh, I can't find it." Huh? What professional doesn't have his negatives?
Okay, I can copy it, but our photograph copier only makes 8x10 photos. I can send out your 8x12 for a better copy.
"No. I don't want it to leave the store."
Okay, you're going to lose 2 inches of photo. I led him to the machine and tried to set up the copy the best I could. He would see the preview come up on the screen and complain that it was missing the ends. After 8 tries, each time I'm explaining that he WILL lose the ends, I let him set up the photo on his own. When he was ready to print, I AGAIN explained that he would not be getting the entire 8x12 on his 8x10 copy. I also told him NO REFUNDS!
He gave the okay, seemed happy, paid and left.
One week later...he was back. And mad. The copy didn't have all the image and he wanted his money back. I told him no. He yelled. I reminded him of our conversation, that he set up the copy, and okayed it. He called me a liar. I threw him out.
He came back with a Mall Security Officer. The officer asked him to stay outside while the officer talked to me. The officer asked me what was up with "that jerk". I started to tell him, then "that jerk" came in the store. The officer asked him to step back outside. He refused. I finally looked at him and said, "If I give you your money back, you never NEVER come into my store again." He agreed. I gave him back his $10. The officer told him that if jerk ever came into the store again, he would be arrested for trespassing.
But wait...there's more!!
The next day, I got a call from our home office. Jerk had called to complain about me. Not that I had throw him out forever. Not that he was threatened with arrest. Nope, he was complaining because he had entered some (bad) photos in our company's photo contest and he hadn't been called yet to tell him he'd won. Customer service wanted to make sure I had really entered his photos. Yes, I had.