I know not everyone would want to act out things in class, as I would not. However, this is something I plan to try--put topics/terms on index cards and put them in a box. One student draws one out of the box, and can act it out, can draw on the board, can describe it verbally, anything BUT use the term itself to try to get the class to guess what it is. My students seem to love extra credit, so it could mean extra credit for the one in front of the class as well as the one who guesses correctly.