This improv game is in the following improv game categories:
All players mill about the room. At any point the trainer yells "Yes!", at which point all players `jump` into a position. Trainer can (but does not have to) sidecoach by shouting `direction` (see Fast Food Laban ) like `horizontal`, `up`, `down`, `sideways`, `big`, `small`, `light`, `heavy`.
The idea then is to let the position into one has jumped inspire the player to a character, a situation. The inspiration comes from associating the position with, erm, well, whatever comes to mind.
See also Association Jump for an extension of this exercise.