The Memory Game
This is an entertaining activity that requires a group of people in a circle. The bigger the group, the more fun the game can potentially be. The game begins with one person saying, "I'm attending a picnic, and I'm bringing [some random item]". The players proceed in a circular motion, adding more items to the list. As the game goes on, the players have a harder time recalling earlier items on this list. If the group is drinking, this will be even funnier, as it lets the group see who is the most inebriated.
Would You Rather
This game can get crazy, so make sure you do not offend anyone. Form a circle with a group a friends and designate a person who will start the game. The "starter" poses two difficult-to-answer choices, where everyone will have to answer the posed question. A sample question could be: "Would you rather spend the night in a cemetery, or eat a loaf of moldy bread with a glass of expired milk?" The questions and perpetuated situations can become even crazier (and personal) as the night goes on.
Charades
Charades requires your friends to divide into two teams. Write suggested movie titles, books or phrases on small pieces of paper and place them into an opaque container. One member of the team closes his eyes and randomly picks one of the slips of paper. This member must then use body language to convey the message to his team members without making any audible noises within a set amount of time. The teams can play for points or just to have fun.
Apples
Everyone breaks into pairs. Each pair has an apple balanced between their foreheads. The object of the game is to play music with a fluctuating tempo and having the pairs dance while trying to keep the apple from slipping and falling. The last couple standing with an apple wins the game.