Real Shizz

If you're trying to flirt mildly and just let him know you're keen (but not TOO keen as that isn't good), DON'T go straight in and start throwing him against walls, BE SUBTLE!
Guys hate it when girls are over keen. Play it cool. Brush past him gently. Smile ALWAYS. Don't talk about YOU, talk about HIM. Be interested. Don't be too forward. Don't act like an idiot. CERTAINLY DON'T TALK ABOUT THINGS YOU HAVE NO IDEA ABOUT! you'll just looks stupid.