What is the best food you ever ate in a fast food restaurant?

Ok, so I realize that for a lot of people, especially “foodies” the idea of fast food=good food is an impossibility. If that includes you, feel free to refrain from answering. But perhaps, unexpectedly, you had a positive experience at a fast food restaurant when the food far exceeded your expectations, or at least, made you want to go back again. If this is you, please share! For my part, I have to say that at the Weinerwald in Geneva I had some very respectable schnitzel. And I am comparing to the schnitzel I had in Bavaria and Vienna. How about you?