I haven't had any particularly interesting random encounters, but I frequently experience that moment during which you realize that someone you *thought* you knew has managed some extraordinary achievement or is blessed with an amazing gift. For example, I recently found out that a friend of mine has a book deal with a major publishing house. Another time, I was visiting a friend and came upon a beautiful painting. The artist? Said friend.
I know it's irrational, but I always feel like there's been some kind of betrayal when that happens. If you're the next Frida Kahlo or some kind of math genius, you can't just keep that information to yourself!!! Sheesh.