This mom has a smart kid... don't we all! Going brain dead and keeping calm is what we're trying to do when we keep repeating "I know". Sometimes parents are challenged when we want to laugh at what happens. wink emoticon
I was getting my son ready for bed. He said, "I want X" and I said that we weren't going to do that tonight. He said, "But I want X" and I said "I know" and then he said it again and I said I know again. The funny thing was that he followed me and he said "Well, since you know, then can you come over and do X."
I thought it was so clever I almost gave in, but stayed strong!