Another quotation from the eponymous Mrs Malaprop (in Fowler s.v. malapropisms):

Sure, if I reprehend anything in this world, it is the use of my oracular tongue, and a nice derangement of epitaphs. (apprehend, vernacular, arrangement, epithets)

The line between malapropisms & eggcorns, and between them & folk etymologies, must sometimes be a fine one.