What is your “red line” that would make you unambiguously and sincerely say with full belief, “Aliens are real and are or have been on Earth”?

I realize in my limited posting here I may come off as a “believer”, but if on a 0-100 scale, that a hard zero (I will say unapologetically) is a clown like Phillip Klass who even left it in his last will and testament that no one should ever have confirmation of aliens out of his virulent spite, and a 100 is the sort of person who will literally believe anything that implies “alien”, no matter how wildly crazy or improbably… I’m somewhere in the 50-75 range.

Sort of like:

• 0: “I’m Phillip Klass ... Read even more