Unfortunately, I think I served some guests the worst food ever once. The first Thanksgiving dinner I cooked was 2 years ago, for a group of ex-pats in Vienna. I'd never made turkey before, and the guests were 1 1/2 hours late. So... I just left the bird in the oven that much longer. This combination led to the driest, hardest turkey meat you have ever eaten. There was so much juice in the bottom of the pan, at least a quart. But even pouring it over the particle board.. er... meat... didn't help. No one said anything, they were much too polite. But I was so embarrased.
Slighty OT, because we weren't guests, rather we were at a restaurant and the owner was incredibly rude.
My fiance ordered Klachlsuppe, which is a traditional Austrian soup made of (knuckle?) joints and the broth they are in. Now, bones and joints do give you the best-tasting soup. But in this soup, you're supposed to eat the cartilage and connective tissue from the joint. I guess Fiance had been thinking of something else, because he basically just ate the broth and what shreds of actual meat he could find on the joint. When the owner came to clear the table, she was shocked that he hadn't finished his meal.
Her: "What, don't you like Klachlsuppe? Why did you order it if you weren't going to eat it?"
Him: "Er... I guess I remember it being a little different than this. But the soup was good!"
Her: "Hmmph" Walks away with the bowl. Returns with his main course. "Young people these days won't eat anything that has just a little bit of fat on it. All they want is lean meat. Our traditions are disappearing. The world is coming to an end. Etc, etc"