a new opener i thought of for college...
you see a HB you get her attention by simply in a soft tone saying "how you doing?" cos its college girls often respond make sure you get her attention... then after she has said fine im good whatever and shes about to walk off ask... "was it you that walked into a door this morning" she obviously says no if she says yes your in!
she says no you say "well she looked exactly like you, i remember because she was very attractive as are you
, are you sure it wasn't you? 
" she starts giggling a little yes im sure blahblahblah, "well anyway my names ***** it was a pleasure meeting you" now you make sure you show that you are leaving not her you say "right i have to go now but if i see you around i would like to have a more in depth conversation, oh yeah and dont walk into anymore doors give her a little wink and then walk off" next time you see her which will happen cos its college you open her engaging asking how shes been and stuff all that general bullshit say "it was a shame you had to leave last time i would have loved to spend some more time with you, you free at all this week?" if shes interested shell say yes it will be a simple number close if she says no then simply say no worries and proceed to sarge the rest of yuor school
haven't tried it but i plan on doing so any thoughts?