E said wow, uh oh, yay as expected but I was surprised with the less common expressions that popped up. She says boo when she doesn't want to do something like sit in her high chair. Then she says ta-da when she takes a pen cap off, releases a stuck item, or waves a roll of wrapping paper like a wand. The latest is 'UM' She says this and taps her chin and looks up like she is thinking. It is such a bad habit but it is so cute. Any unexpected expressions from your LO?