Food poisoning woe
My family and my aunt's family went to a Japanese buffet type place. It all looked very good and tasted fine... until I made the bad decision to try the fish soup. Apparently it had not been cooked enough, at all. Soon I started feeling very ill. Then commenced the "Day of Vomiting" when I was subjected to endless Monty Python jokes. "Bring me my bucket" "the mint it is only wafer thin" my cousins said as I yarched into a trash can for a day. I was like a TARDIS full of puke. Not really a crap meal out since it left through another exit.

Edit: Remembered another one
Someone I know that shall remain nameless used to work at Burger King. A customer was being a total asshat when ordering a cheeseburger, so the manager told him he could give him a cheeseburger special. This consisted of placing the cheese slice between his buttcheeks and rubbing it like toilet paper. It was then placed on the burger and served to the customer. Whoever that customer was, they sure had a crappy meal.

Edit2: The Curse of the Hair
For about 5 years every single meal from a restaurant my sister went to had a hair concealed in the food. After the first few times she would look suspiciously at her food, check for hairs, and then take a bite, only to find a hair anyways. She must have pissed off a gypsy or something. It finally stopped though, and no it wasn't me or anyone she ate with that put them there. They just magically appeared. Could have been worse, at least they weren't curly.
(evil_penguin_17 Robots of Doom... Attack!, Fri 28 Apr 2006, 2:27, Reply)