Are you kidding? Let’s try to keep this a real world scenario. If you find a roach as you are finishing a pie, there isn’t a restaurant in the world that won’t comp your meal - and then some.
On your next comment, I know that satisfaction is an implied term, but the menu isn’t asking you to to pay the gratuity on a large party, its telling you that you will be required to pay it no matter the manner in which the food reaches your table. Again, in the real world any manager will take care of things if service sucks. In this country, tipping is a well established custom and is not required. However, if a certain restaurant (not that I’ve heard of) has a sign stating that “all meals will have a gratuity added”, then that custom doesn’t apply anymore - it is legally enforcible. You aren’t being forced to enter the “contract”. If the menu says a chicken dinner cost $10, don’t you agree that you are required to pay $10?
Finally, a non-working car doesn’t necessarily mean a breach-of-contract. I’ve known plenty of people who’ve bought non-working cars to fix them up. That’s why I mentioned it’d be pretty unusual to buy a car without some specific details in the purchase agreement. Besides, its not the seller’s fault if a buyer doesn’t thouroughly inspect a car prior to purchase. I just used the car example because it represents something where you have certain expectations, but they fall short. Did you want a Chevy and they delivered a Chevy? Then pay up. Did you want a Chevy and they delivered a Ford? Then they haven’t fulfilled the deal. "oh, you didn’t say you wanted it to run. Caveat Emptor.