This happened around three years ago, when I was on holiday in Greece.
Me, mom and dad went into this restaurant that looked really cool and got a table on the roof, with a view of most of the small town we were in. The waitress came pretty quickly, spoke very well english and smiled at us, giving us the menus and whatnot.
That's when things went downhill.
We found out pretty quickly what we wanted and waited thirty minutes for the waitress to come back. She was up there a lot, we waved at her and even tried to call her over, and when she finally did notice us the first thing she said was "oh! I forgot you guys!" WTF?
I ordered some pasta without the chili that was in it since I don't handle spicy food, and then we waited. For 45 minutes. When the food finally came it looked okay, and we started eating. After a short while I started feeling really sick and we called the waitress over and asked if she could take the food away since I got a really bad stomachache. She asked if I wanted her to take my temperature and mom and dad firmly told her no while I sat trying not to throw up. The waitress asked again and again if I wanted her to take my temperature, until I finally had to run to the bathroom.
The first thing I noticed was that there were a lot of ants on the floor, but that wasn't the biggest problem at the moment, so I kneeled slightly and pushed up the toilet lid. And you wouldn't guess what I saw.
That's right. A rat. Dead by the looks of it, covered in ants and half eaten by them too. I threw up right there. I went back to my parents, asked if we could leave and they said they'd already asked for the check. Apparently, mom found ants in her food, too.
The rest of the holiday I spent with food poisoning.