Flippin' The Bird Fer Jesus

Yesterday evening Hubby and I ran a few errands before dinnertime. At a traffic light we waited behind a church bus full of what looked to be elementary school kids.

One of the little boys, he looked about seven or so, stood up, looked squarely at us, and flipped the bird. Hubby laughed, wagged his pointed (index) finger at the little boy as if to say, "That's not nice and you know it."

The little boy flipped the bird again, then one of his little buddies stood up and flipped the bird too.

These boys were on a church bus.

What exactly was the Sunday School lesson there last week?