This one is simple. Post a word or phrase that rhymes with the one posted above him/her and post another word that the next poster will give the rhyme for it.
Example:
[quote][b]Me:[/b] lame
[b]Poster 2:[/b] shame
lie
[b]Poster 3:[/b] die
fight
[b]Poster 4:[/b] night
cat[/quote]
and so on...
Let's start
[b]cry[/b]