Journey by Stephen Clark  
    to Ridgetown

The alien is taken aback. "Extirpate?", he says. "You know the word extirpate? I'm impressed. You must be a very intelligent human. I'd like to take you back to Glorrzap our home planet and show you our advanced civilisation. Oh, and I was only joking about the earth-invasion thing, by the way."
    So the alien takes you back to Glorrzap and you are shown some wonderous things. Led around by a team of Glorzzapian government diplomats, you see the incredible new technology which has enabled them to eliminate death and disease, travel to far-off galaxies, abolish poverty and eliminate all forms of sadness and negativity. You take everything in and try to remember it so that you can take all this knowledge back with you when you return to earth.
    Then, a few days later, you are introduced to the leader, the king alien. When he meets you, the king says, "It is a great honour to meet a human from earth. I am sure this is the beginning of a new era of friendship and cooperation between Glorrzapians and Humans."
    He stretches out his hand. Do you shake it?
Yes, shake it
No, don't shake it