Nice one, Will - I still use those mix-ups, though I wait in vain for those grandchildren as both my son & daughter have better things to do. I'm not sure who first said who's been sleeping in my porridge? but it still works a treat.

Here's one of my favourite YouTube videos; I've no idea what he's singing though - chances are it's Old MacDonald...

http://www.youtube.com/watch?v=DzahAyVvz94