people do get things in their heads and overgeneralize, it's quite true. i had a student who wanted to talk about more than one corpus, so he went with *corpi (pronounced core-pie, of course) -- and i stopped the whole class and had a two-minute tangent about the plural suffix -ora and how it's really perfectly okay to say corpuses rather than put a wrong latin ending on a word because we think we're being erudite. (only i did it without snarking at the kid. [g])

which i suppose means i shall have to abandon lexica. very sad.