38. Rations Heal You
Stay with me on this one. Have you ever eaten a ration? They're disgusting. Revolting. Pre-cooked, dehydrated processed foodstuffs packed into a tin. Rations are the primary means of regaining health in MGS2, which is consistent with the military environment and past games in the series. But really, rations are disgusting. Snake should've brought some quarters for the vending machines.
37. The Legendary Big Boss Is Impotent
Big Boss is the pinnacle of manliness. The beard, the eyepatch, the cigars, the survival skills, the combat prowess, you name it. He is machismo personified...except he can't make babies. Yikes. Apparently he was exposed to radiation during early atomic tests by the US Military, and can no longer reproduce. He might be able to slit throats with ease, but the possibility of teaching Big Boss Jr. how to first-round manually chamber a 9mm semiautomatic pistol is out the window. Poor guy.
36. Biomorts (MGS4)
A biomort is explained as being a brain dead living corpse, if that makes any sense. It's totally fictional (...right?), and doesn't really serve much purpose beyond being a convenient explanation for why people don't actually die for good in Metal Gear Solid.