Principle of Embarrassment: is a principle that is employed to validate the trustworthiness, authenticity, and truthfulness of any historical document. Christian apologetics also applies this principle to determine the historicity of the events described in the Bible. When a source (s) that can potentially damage/s its case admits something embarrassing, these assertions are unlikely to be invented or fabricated.
For examples:
Women as the first witness to the empty tomb of Jesus.
Conversion of skeptics like then Saul (now Paul) and James.