Tooth Fairy!
I love that game...
Get an object, like a coin, and set it somewhere where everybody knows. Rip a piece of paper into smaller pieces, of how many people are playing. Write "Tooth Fairy" on only one of them, and on the rest "Child". Everybody picks one, and keeps what they are a secret, and put the paper back. Then all lay down, and pretend to be asleep, KEEPING THEIR EYES SHUT AT ALL TIMES (otherwise, they would be cheating). Then, they say "Go to bed!", and only the 'Tooth Fairy' gets up, gets the coin/object, and puts it under a random persons pillow, or by their head. Then they go and lay back down, until someone calls daytime. Then, everybody gets up and looks under their pillow, or near them. When the person finds out they got the coin, they guess who the Tooth Fairy was. And the game goes on!
Also: Truth or Dare, or another game, me and my friends call "Dare Me!".
The person who's daring others takes a couple pieces of paper (number depending on how many players there are), and then add a few extra blank pieces for fun. On some of those pieces of paper, they write down dares, and put them in a container when finished. Then, the players draw, and have to do their dares. It's pretty fun to get to see people do funny dares, that you made up!