Sleepover Games

I need party games quick my bday is the 28th of july and i am having a pool party with boys and girls and i am having a sleepover with about 16 to 18 gurls.And i need more games quick.So please help me out we gonna be from ages 12 to 14 so come up with good games and come up with some quick and if the games are retarded please dont put them on the message boards!Thanks and have a great day!!!!