What records are there of Latin speech errors in Ancient Rome?
I know of spelling errors, e.g. in graffiti, which provide evidence of sloppy or varied pronunciation, but I'm interested to hear about speech errors of the sort that provide evidence of how deeper features of the language, especially the grammar, were represented in people's minds.
The paper "To Err is Human; To Study Error-Making is Cognitive Science" by Hofstadter and Moser provides a variety of illustrations of this kind of thing. For example, in English, a waiter says "Party for two?", accidentally combining the common phrases "Party of two?" and "Table for two?" Another: "The French turn down their noses at rosé wine"—confusing the phrases "turn up one's nose", "look down one's nose", and "turn down". Another: "It was pretty upsettling"—this one blending the words "upsetting" and "unsettling" into a nonsense word.
Presumably these speech errors result from simultaneous processes activating the related phrases. Normally one would "outcompete" the others and inhibit them before the signal reached the mouth, but occasionally they combine. The combined elements, and how they combine, say a lot about how the language is organized in the brain: what "slips" most easily—the competing elements—and what doesn't—the structural properties that are preserved even in the error, like the way "upsettling" has the structure of an ordinary English word even though it's not a real word.*
I'm driving at grammar, though, so here's a more relevant illustration from English (from this question on ELL):
The thing that scares me the most are the little oranges in its stomach.
This happens a lot in spoken English—sometimes even in written English. The speaker feels a pressure from "thing" to make the verb singular and a pressure from the upcoming word "oranges" to make the verb plural, and fails to sort it out correctly before the word has come out.
So, did anyone record anything like that from native speakers of Latin?
Maybe this will shed some light on a confusion that I was recently relieved of here.
*BTW, I accidentally typed "real world" instead of "real word" while writing that sentence.