SO ONE TIME AN ASTRONAUT WENT OUTSIDE TO GET A SCREWDRIVER TO FIX HIS SPACECRAFT. BUT WHEN HE GOT BACK TO TELL HIS CO-FRIEND THAT HE HAD IT..BUT THE DOOR WAS LOCKED; HE POUNDED ON THE DOOR BUT NOBODY WOULD LET HIM IN. FINALLY WHAT SEEMED LIKE HOURS..THE GUY CAME TO THE DOOR ASKING "WHO'S THERE"?