Be real. Are you trying to be friends with someone to be accepted into a certain clique, or because you'd like to get to know someone else that he or she knows? That's not friendship, it's opportunism. Every new person you meet has the right to be accepted (or not) on his or her own merits, it's better to just be yourself than let anyone else influence you into being someone you are not. And you should fill their brain with good things. Remember, it's better to be hated for who you are, than to be liked for who you aren't.