Each person draws only a piece of an animal without being able to see the piece drawn before them.
paper
pens/pencils/crayons
This activity is similar to cadavre exquis drawings:
Fold a paper horizontally several times, and the first person draws the beginnings of a Fantastic Beast, and then you flip the fold to the next segment for another person to continue the drawing their way. . .no peeking at previous segments! (a bit of the previous segment has to be showing for the next person to see where to begin their lines) When the drawings are unfolded at the end, the result is hilarious!
Pictorial example of cadavre exquis:
http://www.nicedog.com/carol/corpse/corpse_howto.html