Originally posted by Tamper Lad:
Which brings up an important question about Doubleheader physiology. When Frenk goes on one of his benders do they share the hangover equally or is it pushed over to Dyvud's side?
Well, the closest RL equivalent to this situation is conjoined twins (aka "Siamese twins"). And it actually varies from case to case, depending not only on how they are physically connected but also on their psychology. For example Daisy and Violet Hilton learned self-hypnotic techniques (from Houdini himself!) in order to gain privacy; they could use this to ignore what their twin was doing.
Frenk and Dyvud would be in this case a dicephalus dibrachus; that is, two heads, two arms, and a common torso and legs. Because most of their body is held "in common" between them, most likely both would be affected by the hangover. Abigail and Brittany Hensel of New Germany, Minnesota would be a RL example of this particular physiology. For more details, see
http://en.wikipedia.org/wiki/Abigail_and_Brittany_Hensel