I get up to leave at about the same time Ian is telling a joke; this joke's punchline involves a lot of death. The restaurant's manager appears on a screen and starts screaming at him. Finally, an exchange something like this happens:
Manager: Do you know the original version of that joke?
Ian: Yeah... [tells a variant set in Nazi Germany]
Manager: Then you're responsible for World War II as well!!!
At that point I jump in and start yelling at the manager, until one of the assistants jumps in and takes over the screen, effectively ending the argument.