Just the other day, she mumbled something that both Isaac and I didn't understand, and then she started to crack up so hard. When we asked her why she was laughing, she said, "Sophia funny!"
Well, if that was her first joke, then here's her first "understandable joke": she finds it extremely funny to call us by each other's names. For example, when I ask her to comply with whatever it is I'm saying to her with a "Yes, Mama", she'll say, "Yes, Papa" and start to giggle. She does the same thing to Isaac by saying "Yes, Mama" to him.
But, with her increasing verbal skills, she's also able to express more sorrow and dismay. Like the other day after we went to tot-swim in town and then visited Isaac at the school for lunch, we turned onto the main road heading out of town, and Sophia said, "No home yet!" Poor thing - she just didn't want the fun to end.