Nothing but dust....

Sometimes you come across a joke that transcends all jokes...this is one:

"Dear Lord," he began with arms extended and a rapturous look on his upturned face, "without you we are but dust..."

He would have continued, but at that moment one very obedient little girl (who was listening carefully for a change) leaned over to her mother and asked quite audibly in her shrill little girl voice, "Mommy, WHAT is butt dust?!