Have you ever met a stranger that you will remember forever?

I have two - I live in a city and I was sitting on a bench one day in a park. This guy comes up to me and he can't speak or so he claimed. He basically "asks" me to help him fill out a job application. I'm thinking is this guy going to shank me or what but I kept my faith and I help him finish it. To this day, I wonder if I was on some sort of hidden camera or if it was some sort of test of humanity run by some college students for a sociology class. The second was a guy that used to beg for change on my way to work (same area). He was very pleasant and I got to know him because I'd walk by him every day. I'd give him a buck here and there but I figure one day, I'd buy him some food, so I buy him a corn muffin. I bring it to him and he yells "I don't want no corn muffin man, I want MONEY!" I never took that route again on my way to work. I wonder where those guys are today, 20 years later.