Mechanics using counterfeit parts is also a common horror story. A customer believes they are getting quality parts for their vehicle but later finds out that the mechanic used fake parts which can lead to further problems down the road. Also, some mechanics might not be honest about the work they've actually done. They might claim to have replaced certain parts when they really haven't.
There was a customer who left her car at a mechanic shop for a brake repair. When she got it back, the brakes were still not working properly. She found out later that the mechanic had used sub - standard parts. She had to take it to another mechanic and pay double to get it fixed right.
Well, there was this customer who thought his car was haunted. Every time he started it, there was a spooky noise. Turns out, a mouse had made a nest in the engine and was moving around. Another story is about a customer who filled his windshield washer fluid with vodka by mistake. When he tried to clean the windshield, the whole car smelled like a bar.
A customer drove his truck to the mechanic shop. He complained that his truck was shaking violently. After inspection, the mechanic discovered that the customer had put on tires that were completely the wrong size for the vehicle. He had bought them super cheap without realizing they were not for his truck.
A mechanic once failed to properly tighten a bolt on the landing gear. When the plane landed, the landing gear partially collapsed. Passengers had a very rough landing and there were some minor injuries. This incident led to a thorough investigation of the maintenance procedures to ensure such mistakes wouldn't happen again.
One common theme is dishonesty. Mechanics might lie about the problems with the vehicle to overcharge customers, like saying a major part needs replacing when it's just a minor fix.
One of the worst mechanic horror stories I've heard was about a guy who took his car in for a simple oil change. When he got it back, there were strange noises coming from the engine. Turns out the mechanic had used the wrong type of oil filter, which caused a blockage. It cost him a fortune to fix the damage that could have been easily avoided with proper attention to detail.
There was this mechanic who told a customer that their car needed a complete brake system overhaul. The customer trusted him and paid a large sum. Later, the customer found out from another mechanic that only the brake pads needed changing. The first mechanic had lied just to make more money. It was a real horror story for the customer who ended up paying way more than necessary.
I used to work in retail. There was a customer who returned a clearly used item. When we told her we couldn't refund for a used product, she started to make a huge scene. She threw the item on the floor and screamed that we were thieves. It was so embarrassing and scary for all the other customers in the store. She even tried to intimidate our manager into giving her the money back.
One horror story is when a customer asked for a small, simple flower tattoo on their wrist. But the tattoo artist was inexperienced. The lines were all wobbly and the flower looked more like a blob. The customer was really disappointed as it was supposed to be a meaningful and beautiful tattoo.