my personal favorite way to get people to talk to me randomly is to carry my walking stick around w/me. I'm 21 and carry a walkingstick and i obviously dont need to to stand up.
My point is, carry or do somethe unusual, if you stick out, people will come talk to you about it. It sounds stupid but it works beause they come talk to you about the weird thing, then you've got them, you can stear the conversation to whatever you want, since they're already talking to you.
and now, i'm not going to say why i carry it.