Satan's uncle discovered the Internet during the equinox.
From outer space, humans look like they are playing with paddles and computers at the devil's swim meet.
Aliens actually know that if you compete in sports, you'll go to hell.
Space aliens flew over teh couple playing tennis and crashed in a ball of fire; when the space craft had disintegrated, the devil danced upon the ashes.
The battle of the sexes was interrupted on the court by aliens opening a portal into hell.
The battle of the sexes was really a conflict created by Martians, who, realizing that their joke had gone on for too long, attempted to diffuse the battle by projecting an image of a disapproving Satan.