God is tired, worn out. So he speaks to St. Peter, "You know, I need a vacation. Got any suggestions where I should go?" 

St. Peter, thinking, nods his head, then says, "How about Jupiter? It's nice and warm there this time of the year." 

God shakes His head before saying, "No. Too much gravity. You know how that hurts my back." 

"Hmmm," St. Peter reflects. "Well, how about Mercury?" 

"No way!" God mutters, "It's way too hot for me there!" 

"I've got it," St. Peter says, his face lighting up. "How about going Down to Earth for your vacation?" 

Chuckling, God remarks, "Are you kidding? Two thousand years ago I went there, had an affair with some nice Jewish girl, and they're STILL talking about it!"