Talking back

The other day Pax crawled over to the stairs and started to climb up them. I asked him to stop and to come down a few times.. he was looking through the rails at me and got this smirk on his face put one hand in the air and waved at me and said "BYE!" and continued to climb up the stairs... I am in for trouble with that kid! He is too cute though.. who could not smile at that face?