Wssup all. This opener is my favourite. This works so good that i can't put it in words, you just have to test it yourself. I have invented it, or there are maybe someone else who have thought about that and uses it.
It goes:

You pretend that you know the girl and go like "Jessy? (laugh) You gonna pretend like you don't remember me?" At this time she looks like a question mark
Then you ask her "Aren't you Jessy?" and she'll say "no". You say something like "Damn Girl" or "GodDamnit, you look like a girl i know by the name Jessy, and she looks exactly like you!" You watch her friend if its a two set or her friend(s) if it's a three set or more (with a smile) it makes them smile directly. Then you look at her friend(s) and tell them that you know a girl by the name Jessy who was very good at running fast, and played soccer, so eventually a team in Italy bought her, and that she's been there for 2 years, and now i thought that she had come back and didn't recognize me then you (smile). It will make them laugh most of the times.
Either if it does or not you can continue by "by the way, are you all best friends?"---"Because you got the exact same facial expressions"... And so on...

//God bless you all.