'No'

I was changing Tyler and he was reaching for something, skirming around and I told him 'no', he looked back at me gave me a very cute smile and told me 'no'. What is a mom to do other than get excited and say, you said no! He says it back to us all the time. First word - mama, second word - dada, third word - no - oh the start to the back talk? Very cute.