Sleeping bottom
While we were on holiday, Miss 3 needed to poo at Great Grandma's house but refused to use her toilet. So we took her back to Grandma's house. She refused to use that toilet or the potty either, so we decided to go home early. Same story at every public toilet we stopped at on the way home, with lots of complaints about her "stuck poo".
She eventually pooped after we got home, and announced "my bottom is awake now!"