I was pretty young and at the beach with my family. There was a giant cluster of rocks that sort of split the beach in two. I really wanted to climb the rocks but my mom wouldn't let me. We walked up to this woman and my mom asked her if she knew of a pass through the rocks to get to the other side. The woman replied, "Yes, over there by those humans," and pointed to a group of people.. To this day this is the only proof I need that aliens exist.
TL;DR I met an alien once.