@carrotisland: This is a great game for parties, especially if you know who is coming ahead of time. It is called the lie detector game. It works well in groups of people who don’t know each other very well.
Before the party, or even on the invitation, ask each guest to bring to the party a piece of paper with some information about themselves. They need to put 3 statements about themselves, only 2 of which are true. During the party, the guests will take turns reading their statements. They should all be presented as though they were all 3 true.
After each person presents their statements, the group decided by voting which of the 3 statements is a lie. It’s really a fun way to get to know each other.