This is a game I played once.  The first person (me) writes the first verse of a haiku (5 syllables), then someone else writes the next line (7 syllables) but no more, finally someone else write the third line (5syllables) which also becomes the first line for the next haiku.  I have seen some fascinating poems come out of this as well as a few hysterical ones.

Now the first line:
                                  Soft, fragrant winds blow

Soft, fragrant winds blow
whipping about the remains
of the lace curtain

of the lace curtain
imprisoned sapphires shone true
true blue like they do

true blue like they do
the bottlefly to the dung
sated buzzing sung

sated buzzing sung
alas, nowhere to be hung
lie down beside me