Parapraxis is a fancy name for what are commonly called  "slips of the tongue" some of which  — typically if there is a sexual  connotation -  are called "Freudian slips," the implication being that the mind is  really concentrated on something else, and that "something else" is unconsciously  revealed,  particularly if the person is flurried or stressed

I remember a [true] story from my youth, where there was a weekly insurance collector who called to the home of a working-class woman with a large family of kids. He was a kindly, pleasant man, but had an unusually large red protruding nose with huge wide flared nostrils. The kids made fun of him in private and when the weekly knock came at the door they would shout out: "Mum! It's the Nose!"

As was customary in working-class Liverpool in those days, regular callers and tradesmen were invited in at Christmas time for a cup of tea, or a warming glass of spirits in accord with the seasons goodwill.

Mr Jones [the nose] called on a Thursday. On Wednesday [and again on Thursday morning] the mother got all the kids together and warned them not to make any remarks nor even look at the man's nose when he called. Even after a rigorous admonishing she was still petrified that one of them would forget her caveat and pass some potentially hurtful remark. That evening the dreaded knock came on the door. "Please step in Mr Jones and have a cup of tea — or perhaps a drop of scotch?" The man came in and sat at the table. Six pairs of little eyes gazed at him unblinkingly. "Tea please," smiled Mr Jones, "I better not have a whisky, for I've still got a lot of calls to make."

The woman looked around at her tribe of kids, screwing up her eyes in another visual warning. Hands trembling she passed him the cup. "How many spoonfuls of sugar do you take in your nose Mr Jones," she said.

THAT is parapraxis. A minor, inadvertent mistake, usually observed in speech or writing or in small accidents or memory lapses, etc. and this incident illustrates that Mr Jones' nose and the potential hurt which would be occasioned by some silly remark or action by one of her kids was on her mind more than the cup of tea.