Say "Ewww"

When A first learned how to pick his nose and eat the findings I made the mistake of making a big deal about it. I said "Eww! A, that's gross! Don't do that again!"
Now, A will pick his nose. Look at me. Stick his finger in his mouth. Smack his lips. Say "Mmmm, mmmm. Boogers!" Then he'll walk over to me and say "Mom. I just ate my boogers. Say 'Ewww!'".