Alfie is cleaning up

One lesson that we always enforce our kids to follow is cleaning up their toys after playing. One day, after messing up the toys with his bro Alwyn, Alfie just left the room. Of course I asked him to clean up. "Alfie, please clean up" then continue with the usual song "I see Alfie cleaning up, I see Alwyn cleaning up..." In a second, Alfie picked up the song and sang together with me. But he didn't start cleaning up. So I asked "Alfie, why don't you clean up?" And he answered "I am singing, so I don't have to clean up." Oh, kids...