Some time ago in St Louis, I stumbled upon Eat-Rite Diner. Aparently I wasn’t the first to be taken in by its charms. Yelp notes:
This is a MUST in St. Louis. However don’t go here for the friendly staff, good food, or fun atmosphere. This place is a joke! They will need to buzz you in the door to come in and try the delightful SLINGER. Eat right or don’t eat at all!
From Eaten Alive Books:
Another historic diner with a waitress/cook duo straight from the fifties. Open late night (post bar close), food for an iron stomach, not a wobbly one.