Alright so I'm still new to this so hopefully someone will give me some pointers. Yesterday I went to a frat party in an apartment for a frat I am interested in pledging next semester. Lets start with girl 1. She looked very familiar to me and I could have sworn I talked to her before somewhere. So I open up by saying "Hey I think I know you from X". Embarresingly she didn't recgonize me and I didn't really know what to do from there so we stopped talking. For this interaction I have two questions. IF I've been introduced to someone briefly before should I still talk to them or just ignore them? Also in situations in that where the girl doesn't recongonize me or pretends she doesn't recongize me, what are some good negs or something else to say? Ok lets go to interaction 2. I overhear I girl asking someone if you know x and I say Oh I know him, and then ask her about other guys in the frat she knows. We hit it off briefly and I see she didn't have a partner for beer pong. So I joined her. She was brushing her shoulder on me and me and her were smiling and joking the whole time. How do I escalate after her shoulder brushes on me(multiple times) and I touch her a little? I knew she was interested(Had all IOIs) but I wasn't sure what my next move was. Can anyone help out a 21 year old virgin?