A few of them ask for fiber paper. Many of them ask for things they don't understand. I spent five minutes one evening explaining to a customer why I charge extra for toning prints. When she picked up the prints a few days later, she could not remember the conversation, told the lab owner I never informed her we would charge extra for toning, and said she would never set foot in our store again. I only hope she asks some of our competitors how much they charge for toning.
Most customers are far more agreeable.
One brought some negatives she shot at a rock concert. The band shall remain nameless because they don't allow people to take photos at their shows. She had one unprocessed roll and wanted t know if I could bring out more detail than the thin negatives she showed me. I said I would try. When I took her negatives out of the wash they looked great.