In which John creates a list of the six most important conjoined twin pairs in history (in his humble experience) while also discussing his massive zit. Twins discussed include Chang and Eng Bunker, Millie and Christine McCoy, Lori and George Schapell, Giacomo and Giovanni Tocci, and the Biddenden Maids.
EDIT: I'm probably wrong about the Emancipation Proclamation freeing the McCoy sisters, although I haven't confirmed it. The E.P. did free some slaves, but most weren't freed until the 13th amendment.