Magical Girl Lyrical Nanoha: Shamal has the ability to project her hand a long ways, which she uses to retrieve Nanoha's Linker Core. It looks disturbing enough as it already is, but then consider how it could be more violently used: to rip out someone's... brain? Heart? Spine? Penis?
Given how long the Book of Darkness must have existed, it would be statistically improbable to never have had male masters. If we assume, as we aren't given any reason to think otherwise, that its possession of a master's body always results in a female form, then what would happen to the males' family jewels? OHSHI-
The history of the Wolkenritter is one of implied horror. When they first encounter Hayate, they aren't used to being treated as people instead of servants bound to the whims of their master; as a result they become fanatically loyal to her. Think on what kind of treatment it would take to make them so cold and bitter and that three of them are young women and a little girl. Although, it might actually be worse to consider the alternative — that Hayate is typical of the masters of the book, and it's been wiping their memories of person after person that they've loved, leaving them cold, bitter shells.
Striker(s) gives us another one. As if it wasn't already creepy enough that Scagliettiimpregnated his cyborg daughters with clones of himself, consider that he may have done the same thing to Ginga. And that weren't enough, get this: all twelve (possibly thirteen) girls were pregnant at the time of their capture, but fast forward four years to ViVid and at least eight of them are still childless, and there is no mention of a Scaglietti Jr. in SSX. Guess the squeaky clean and shiny Bureau couldn't afford more Scagliettis running around and forced all girls to have an abortion, including the ones still loyal to him. The whole affair is incredibly messy when you think about it.
Uh, that was a contingency measure. The girls would only get pregnant if Jail died. Hence why Fate HOMERUN'd him into a wall rather than killing him. So unless the measure is not deactivated by the TSAB after the end of Striker(s), then that problem won't happen.
The fluff on Familiars is also pretty horrifying. The sound stages state that standard procedure when creating a familiar is to form a contract with a specified end, and when it is completed, the familiar will lose their sentience and revert back to being a normal animal, which is the equivalent of lobotomizing someone down to animal intelligence.
Fate learned everything she knows about magic and combat from Precia's familiar, Linith and it's also implied that a familiar's knowledge comes mostly from it's master. Therefore it can be assumed that Precia has knowledge of magical usage in combat beforehand or gained it through extensive research.
Linith is Precia's familiar, created from her pet cat. However, both she and Alicia were found dead during the day the reactor accident happened. So, how did the dead cat became a familiar? Simple, she was revived by Precia first, possibly to test the effectiveness of Project F.