When Em gets upset, and this happens quite a bit now she's getting her own personality, she tends to start her yelling, crying, etc. and segue into snippets of her favourite nursery rhymes. You can see the tears streaming down her face, listen to the screaming cries and just make out "... all day long." (from Wheels on the Bus).
It's quite discomforting as it reminds of those films where people are being tortured and to take their mind off the hideous act at hand they sing their favourite songs and the like.
Before you call child services on us, we are NOT torturing her and she did not learn this behaviour from such films.
My big hope for 2012 is this whole episode will be replaced with her actually being able to tell us what's wrong, unless she is and "all day long" is actually code for "I'm constipated and my stomach hurts."