Tricks of the trade

Since Eli now has 8 teeth, he is having a wonderful time experimenting with them. We brush his teeth 3-4 times a day, he REALLY likes biting, and he has discovered that he can scrape them together and they make a lovely fingernails-on-the-chalkboard sound. Even more satisfying is that this last trick makes mommy cover her ears, dance in circles, and scream "stop, stop, STOP!" Determined to break him of this habit, I figured the best way would be to make him think that it does not bother me. Here is the scene the other day in the kitchen:

Eli: (scrapes teeth)

Me: (looks up, smiles slightly, looks back down)

Eli: Mommy?

Me: (looks up) Yes, Eli?

Eli: (scrapes teeth)

Me: That's nice. (looks back down)

Eli: (goes back to eating his lunch)

Wait, did that just work? It must have, because he has not scraped his teeth since. What other sneaky tricks can I employ to get him to do what I want? I will have to think about this!