G-d is sitting in heaven when a scientist prays to Him, "G-d, we don't need you anymore. Science has finally figured out a way to create life out of nothing. In other words, we can now do what you did in the "beginning."
"Oh, is that so? Tell me..." replies G-d.
"Well," says the scientist, "we can take dirt and form it into the likeness of you and breathe life into it, thus creating man."
"Well, that's interesting...show Me."
So the scientist bends down to the earth and starts to mold the soil.
"No, no, no..." interrupts G-d. "Get your own dirt."