Hypothetically, if one person is contacted/meets extraterrestrial life, they are said to be crazy or lying. Nobody believes them. Even though many people in the past claim to have met aliens, the majority of the world discounts their experiences.
So, the question is, how could the world be convinced of alien life in one event?
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To be technical an "alien" is a thing that you are unsure of what it is and UFO is only used cause we don't know what the ships are. But I believe that there are other species (which could be considered aliens but not called aliens) out there in the universe, I mean how would it be possible that we are the only living planet or system in the universe