11. Twister
Twister is always a classic party game that always ends in giggles. Buy it here, or make your own mega-board out of an old bed sheet and magic markers or construction paper circles. The bigger your homemade board, the more people can play at once.
12. Name That Tune
Build a music playlist with songs that your friends have probably heard before. Press "play" (either at the beginning or the middle of the song), and call on whoever raises their hand the fastest to guess the name of the song. If they guess right, they get a point; if they guess wrong, they lose a point. Whoever has the most points at the end of the game wins.
13. Trade Up
Break up into teams of three or four and give each team a pencil. The goal is to go door-to-door and try to "trade up" your object for something better (so if someone trades you an old Barbie doll for your pencil, see if you can trade the Barbie doll for something even better at another house). After an hour, all teams meet back up and see who ended up with the coolest item.
14. Freeze
This is an improv game that's more fun when your party's made up of creative people who like to ham it up. Two people get up on "stage," and the rest of the group shouts out a situation (like, "buying a puppy") and a relationship (like, "husband and wife") that they have to improvise a scene around. At any time, someone from the audience can yell, "Freeze!" and both performers have to freeze in place. Then the one who yelled "freeze!" taps one of the performers on the shoulder, replaces them and starts a new scene, based on a new situation that they make up. The game keeps going until everyone has a turn on stage.
15. Suck and Blow
The name of this game makes it sound a lot dirtier than it is (though the game is still a little dirty.) Stand in a circle in boy-girl-boy-girl order. Pass a playing card around the circle using only your mouths, so the person with the card on their mouth has to "blow" it onto the next person's mouth as that person "sucks" it in. If the card drops, both people are eliminated.