Phobia

I've never done that and I wouldn't. But once upon a time we had a really bad experience at a Japanese Steakhouse/Sushi bar. The sushi was excellent and the only thing that was positive about the entire night. When I asked for the manager to resolve the issue I was offered 10% off our meal. This enraged me, so I informed them that I would be paying $20 for the portions of the meal that were acceptable and to show that it wasn't about me being cheap, I tipped the sushi chef the balance.