Either as an entire group or as small groups of 3 or 4, each person gives their name, where they work, what they do, and have them tell two true things about themselves and one lie. Then have the rest of the group guess which ones were true and which one was a lie. You decide how much time you want people to guess (about 1 minute of guessing time if group is small). Then you ask the person who introduced themselves, which part is the truth and which was a lie. They then give the answer to the group.