Always the problem too that the rhyme often only works if you are a Londoner to start with as in "round the houses" ="trousers" but usually pronounced trousies by East Londoners.
Just an aside but I get really fed up when people ask if something is the correct pronounciation NO - the word is pronounced (and spelt) PRONUNCIATION. Nothing said here but there was a woman on the telly last night and she said it several times and I nearly smashed the screen!