Check out the cafeteria at the Milwaukee Public Museum (where I finally got to go!) It's been said before, but it doesn't make it any less true. And the sandwich?
It had good fillings wrecked by soft bread. This is a "gourmet" grilled cheese: cheddar, muenster, tomatoes, bacon and (real!) avocado. Unfortunately, the bread started to collapse immediately upon impact with the paper serving tray. By the time I paid for it and sat down, it was mush. Tasty mush, but mush nonetheless.
My day was saved by seeing some lovely things at the museum, including Carl Akeley's very first diorama from 1890.