Only the "F" doesn't stand for Friday in this case. It stands for finger. A customer at a TGI Fridays in Bloomington, Indiana was inadvertently served part of the kitchen manager's severed finger after an accident in the kitchen. The company has acknowledged the accident and has apologized, promptly and publicly. (Lesson for companies that have a PR problem – like Hilton – this technique works.)
The customer did not eat the food, incidentally.
Odd thing in the story, the customer called the police. I have no idea why they would do that, it doesn't sound like the restaurant did anything illegal. It's not like they were serving human intentionally. Or were they? Bwahahahahahaha.
