I will give you a concrete one. That is undeniable that it came to be fulfilled.
Mark 13:
1 And as he went out of the temple, one of his disciples saith unto him, Master, see what manner of stones and what buildings
are here!
2 And Jesus answering said unto him, Seest thou these great buildings? there shall not be left one stone upon another, that shall not be thrown down.
Matthew 24:
1 And Jesus went out, and departed from the temple: and his disciples came to
him for to shew him the buildings of the temple.
2 And Jesus said unto them, See ye not all these things? verily I say unto you, There shall not be left here one stone upon another, that shall not be thrown down.
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The destruction of the temple in the old testament...
Daniel 9:
26 And after threescore and two weeks shall Messiah be cut off, but not for himself: and
the people of the prince that shall come shall destroy the city and the sanctuary; and the end thereof
shall be with a flood, and unto the end of the war desolations are determined.
From there, if you are talking to a non-Christian, you can jump off onto the Antichrist.
But you had better know what you are talking about.