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C'mon Spock, it's me, McCoy. You really have gone where no man's gone before. Can't you tell me what it felt like?
— McCoy ‧ Star Trek IV: The Voyage Home

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker appeals to personal familiarity while asking Spock to describe an extraordinary experience. Turning an expression about unexplored territory into a question about how it felt makes the request personal. The insistence suggests curiosity that a general description alone would not satisfy.
Context reviewed