The pun game
In this scene each actor will be assigned a general category of stuff. During the scene the actor must reference her assigned category as often as possible. For instance if her category were cars she could reference cars by puns, analogies or direct references.
The person setting this scene up must be certain to get general categories for the actors to work from. Categories like: cars, toys, cutlery, vegetables, etc. The actors should carry out a regular scene and reference the category that has been assigned to them as often as possible.
This is already a gimmick.
This can be turned into a competitive game where the players must list off all the things from a category.