One of my favorites is when I hand something to him, or do something for him and he says "you're welcome!" I tell him "no, you say thank you, I say you're welcome," and he says "thank you, you're welcome."
Whenever he bumps into me or Niles or the coffee table he says "woops, sorry!"
In the morning he comes in and tugs on my blanket and says "Out! Out! Upstairs!"
When anything is found a little misplaced he calls it "silly" - "silly car," "silly Niles," "silly cup."
He calls his flip flops "hop tops" and LOVES to have them on.
Every day when Neil leaves for work he says "Daddy, work, gone!" That's after he's already told me Daddy went downstairs to shower.
I am enjoying him so much right now and love to have little conversations with him. I am constantly amazed at how much he knows and what he is picking up.