I think Joe Adama would evoke a holy shit because most of the audience is still not clear how it could be possible for Adama to be the son of a Cylon. Of course if the “Caprica” sheets are correct, he’s at least one of the creators of the Cylons, and Bill should know that, though Lee might not.

The moment would be the return of Joe Adama, and the reactions of Bill and Lee, it would be a total upheaval for them, and much of the audience. While I believe the Final 5 have been living with the colonists for thousands of years, having many hybrid children, most viewers don’t even see that as possible, they didn’t see Tigh as possible.

The biggest “Oh shit” characters would be Apollo, Bill Adama or Roslin, with Baltar would be harder to classify, as would Starbuck.