There was a restaurant in the States many years ago called "Dick's" and the staff were intentionally rude to everyone and it was part of the theme of the place.
We took my Grandmother to this restaurant and didn't tell her that there was this theme and since she is a nice lady she just took it. It wasn't until the end that we revealed in front of the waitstaff that Grandma didn't know about it. They gave my Grandma hugs and took photos with her. It was adorable.
Wow, so long before Angry Karen's Diner there was Dick's. Definitely didn't have that in my hometown, but we did have a Dick Clark's diner, no relation to the famous Dick Clark, but how can you not use the name for marketing purposes when you are born with it.