just get wasted and talk to people. if its a standard house party, start some drinking games and have fun.

asking people their opinions on what to buy your sister/mother/friend for her birthday <<<< playing flip cup with a bunch of friends and having an awesome time whilst shouting for other people to get involved.

once everyones drunk you can open with anything. you can just pick girls up as your opener. you can flick them on the head. you can say hey i'm tubsy, drink this. hey im tubsy, play a round with us!