Lil Daddy post -- You know what?

I'd like to add a quick post about a Lil Daddy development.. His vocabulary now includes the phrase "you know what?" and it's close cousin "and you know what?". I'm not sure where he picked this up, but he must say it at least 50 times a day (or so it seems!). We're looking right at him as he speaks to us, giving him full attention and he still says this before every other sentence or so. I said to him, "I'm listening to you, you don't have to say that". And it's not like he waits for the answer anyway!