"Take me to your leader," said the first alien. "We have traveled for 30,000 years, after we detected electromagnetic radiation from this world. We had thought ourselves alone in the universe."
"The humans have no leader," replied the robot. "Their's is a perfect egalitarian society."
"What are you?" asked the alien.
"The humans created us to do their work and care for all of their needs."
"Take us to a human." said the alien.
"As you wish." said the robot. Leading them to a building, it opened a door and looked inside. "But first I must change his diaper."