3 Year Old Training - Wanna Go Back to the Toddler Room?

My boys go to daycare/preschool 3 days per week. My youngest just entered the preschool, where previously he was in what they called the "Toddler Room". He absolutely loved the toddler room and his teachers, but has been looking forward to being with the bigger kids and his brother in preschool.

Now, when he doesn't want to pick up after himself, put on his clothes or some other big kid thing, I smile and say, "Maybe we should ask if you can go back to the toddler room."

He immediately says no way and gets to the task. This is too easy, but I guess he'll stop believing me soon enough.