With the recent thread about aliens and whether we are ready for contact with such, if you were an alien species what would you do to make sure any contact with us earthlings was friendly and not viewed as being hostile - and given that if you had the ability to travel to Earth you might likely have a lot more as to technology so as to do whatever you wanted?
Or, anything else, especially if you didn't have friendly intentions.
Or, anything else, especially if you didn't have friendly intentions.