... I had no idea that the word "why" would be my most hated word. Ever.
... I had no idea that my child would expect me to know the answer to every single question, and would respond with anger to the phrase "I don't know" as if I said "I'm not going to tell you, nah-nah-nah."
... I had no idea that "You look beautiful" would sound better out of the mouth of a three-year-old than out of the mouth of a very cute guy.
... I had no idea that a three-year-old who could so easily make me melt would be capable of throwing his french fries on the table and smashing them up just because he was mad that his (beautiful) Mommy asked him to eat them.
In fact, I'm still having a hard time recovering from that last one.