Creativedrama.com describes this mentally engaging warm-up game that requires no materials and can be used for different-sized groups. In a circle, the participants clap in time with each other. The leader begins by saying "I'm thinking of.. " and they add a category that the group will know, like "I'm thinking of a type of car" or "I'm thinking of an action movie." Each person in turn says something that fits the category, on time with the clap. The round ends when someone is unable to say an answer on the clap or repeats an answer. That person is out. Each round ends when someone is out, and the game is over when only one participant is left.
This activity encourages participation and mime. With the group standing in an open space the leader calls out "Let's..." and says any activity they come up with, "scuba diving" for example. As soon as the activity is said the group calls out "Yes, Let's!" and they mime the activity. After a few seconds of the mimed activity, any group member can call out "Let's..." with their own activity, mambo dancing, for example, and immediately the group calls "Yes, Let's!" and launch into the new activity.
This game from dramaresource.com is a group storytelling game. In a circle, the leader begins telling a story using just one word, then the next person adds one word, then the next and so on. The game aims to have the participants let the story flow logically and keep it moving forward, ultimately having a story with a beginning, middle and end.
Standing in a circle, one participant turns to the person on his left and makes a nonsense sound. The person on his left makes the identical sound back to that person, then turns to her left and creates a new nonsense sound. This is repeated around the circle. An added layer can be for the person making the sound to attach a wild movement to the sound. Or, they can send the sound or movement across the circle randomly to participants instead of going clockwise. This game comes from the Drama Resource website.