"Oh, really?" God replied. "Tell me about this."
"Well," the scientist started. "We can now take dirt, form it into a human likeness and breathe life into it, thus creating man--just like you did."
"That's amazing," replied God. "Would you be willing to show me?"
"Sure," said the scientist. With that he proudly bent down to the earth, scooped up two hands full of its finest soil and began to mold it.
"Whoa, there!" God said. "Hold on just a minute. Get your own dirt."
(Thanks to Paul)