I took a trip the the US a few years ago and ended up in New Orleans. Wandered around the French quarter and picked a random bar for a drink or 10. Got chatting to a bloke at the bar who had heard my accent and knew I wasn't from the area and eventually the conversation got to Louisiana food. He asked if I'd had any proper southern food yet which I had not. Took me to a place that had some amazing food. To this day the gumbo I had there is still the tastiest thing I've ever eaten. I go to the bathroom and when I come out the guy says he has to leave and had paid for my food. Said that since I was a guest in the city he wanted to leave a good impression and to pay it forward when I could. Top bloke and would but him a beer if I ever saw him again.