From this morning's epistle: What is this?

So in between yesterday's epistle reading from 1 Corinthians 15 and today's epistle reading, there is this verse caught in the middle (1 Corinthians 15:29):

"Else what shall they do that are baptized for the dead? If the dead are not raised at all, why then are they baptized for them?"

What in the world is that about? This is another of those Nephilim moments. That's the term I use for something in the Bible that makes NO sense whatsoever.

What does "baptized for the dead" mean?