Turn the car into a creature laboratory, where strange-looking people and beasts or any combination of both are born.
Start by folding a piece of paper into three equal sections.
One person draws the face in the top section, then folds down the paper so the next person can't see it. That person then draws the midsection of the body, folds down the paper and passes it to the third person, who sketches the legs in the bottom section.
Finally, unfold the paper and name your creature.