I am the kind of girl who forgets someone easily especially when I'm introduced to a person and that person hasn't always been there afterwards. And when I get to meet them after months or years, I couldn't remember them at all. Someone (or they) should explain how we were introduced, when and where. I feel bad about this.
There are also times when I thought I knew a certain person but I can't recall being introduced to them. Something inside me tells that I've met this guy/girl somewhere but I can't trace anything. Even my friends don't know them. It's crazy how they look so familiar but then I couldn't just figure out how is that possible.
When something like this happens, I just tell myself that maybe I've seen them in my dreams. :p