I belive the key thing to getting girls you like is being funny, interesting and above all mysterious. We all know how to act funny, more or less. But the question is how to be mysterious?

My friend once told me: if you want to be mysterious do something like this.
Girl asks you where are you going? Or why can't you come to that party (You have obligations )
Simply answer: 'I got that thing I need to do' or something along those lines.
When you think about it it makes sense; she wants to know what you have to do.
If you just said: 'Oh I can't I need to take my grandma to wherever.' sounds boring and stupid.

So do you guys have any examples how to strike as mysterious around girls and other people?

Your friend is right.
I have this girl who knows me from my AFC days. Before when she asked me where I was going, I would answer like ''Me and my friends are going to play videogames'' or ''I'm just going to hang with my friends''.

Lately we started talking again and when she asks me what I'm doing on a friday night I just answer like your friend said ''I got a thing I need to do''

She also starts to ask me if I've made out with anyone or kissed anyone. She have only asked this twice but the first time I just replied ''Who have you been talking to?'' and changed the subject. The second time I made it sound like I was lying ''uuh, no.'' and changed the subject

Hope this helps

Also did a quick google search for you and found: 1-vt88223.html?start=0 and http://www.mademan.com/mm/how-be-more-mysterious.html

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