A fun variant is the Chinese Bullshit.
The rules were as follows - the initial 'rumour' or sentance is passed from one contestant to the other, as in regular Chinese Whispers. Instead of words being simply mis-heard, participants are encouraged to add another line of 'bullshit'. So, if you start the game with "Gav has a wooden leg", the next person should probably say "Gav had to have a leg removed 'cause when he was shagging Mrs Ormsbeys husband up the arse, Mrs Ormsbey got jealous and hacked Gav's leg off with a chainsaw. Gav's new leg is that of an ant". You see? The story gets more sick and twisted the longer you play it - my advice - play all day.