I know a girl called Ruby Whose little sister is quite groovy Her name is Eva and she shouts and screams! Makes us want to disappear! Ruby always winds her up till she screams Then gets told off But Eva has a secret weapon When she sees Rubys least expecting There comes a pong without a sound A trouser cough? A silent pop? Oh my god she's done a boff! Run for cover she's let one off Or was it mummy? Oh blame the dog!