Things Common and Unique
Start this game from Group-Games.com by dividing the players into several teams of approximately four to six people. Hand each team a writing utensil and a blank paper. When you say "Go," the players have to figure out as many things they all have in common. For instance, if all of the players have visited the Grand Canyon, they can write it down on the paper. After about two minutes has passed, go through each team to see which of them found out the most things in common within the allotted time. In the next round, have the players talk to each other to find the most things they don't share in common. For instance, if one player speaks Russian, and no other player in the group does, the team can write that down. The team with the most things common and unique written down wins the game.
Message Under a Plate
Perfect for a dinner party, play this game from DivineDinnerParty.com by first setting up your dining table. Write on slips of paper a strange phrase or sentence that normally does not follow the flow of a dinner conversation. For example, statements like "That monkey ate some strange things" or "They never found the woman in the night dress." Slip the papers under the dinner plates. Assign the guests a seat at the table and have them all look under their plates. After everyone has read their messages, tell them all they have to try and insert the messages into the conversation without getting caught. A player can accuse another person of using his message, but if he accused incorrectly, he automatically loses the game. At the end of dinner, see which players successfully used their messages.
Ha Ha
Begin this game, perfect for young and old alike, by first gathering all of the players in a circle, as suggested by Wilderdom.com. Tell all of the players they have to remain as solemn and serious as they can throughout the game. Pick one player to start the game, saying the word "Ha" once. The player standing next to him says the word "Ha" twice. Following this pattern, the third player says "Ha" three times. As the game progresses, eliminate any players who laugh or make noise when it's not their turn. The last player standing, having avoided laughing throughout the game, wins.