A dangerous game to play if you are the teacher, and you suffer from B.O. The chances are that the children will return the phrase "Mr Gardiner smells of piss", and you will not know who to blame. You cannot punish anyone, so you will appear powerless. The children will see this, and be upon you in seconds, and you shall be a skeleton left to bake in the sun before home time.

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.

Our fun-hating teachers had a method of defeating the "Mr Gardiner smells of piss" trick. They would make each kid write down the phrase they had received from the previous kid, without conferring, which could be inspected if necessary to reveal who changed the line. Assholes.