The whole "bibles with f's instead of s's" thing refers to a printing feature that, until the end of the 19th century was quite common. Instead of "s"s, they used "f"s, although without a crossbar.
To see this have the piss taken out of it, read Terry Pratchett and Neil Gaiman's "Good Omens", in which the characters read a 17th century prophecy by "Agnef Nutter" (it reads much funnier than I make it sound).