That's exactly right. The NLPers think that by saying or doing something unexpected during a routine encounter breaks the "pattern" (the pattern being your normal behavior). I've heard of therapists trying to use pattern interrupts to deal with breaking habits and addictions, but mostly they're hailed by people claiming to do covert hypnosis and other nonsense.
The "covert hypnotist" may do something like this: You just met your "victim" and are going through the normal routine. Introductions, where you work, etc. The victim asks, "Where are you from originally?" And the hypnotist claps his hands and says, "No, officer. I've never owned a snake." The victim is now confused, in a mild hypnotic trance, and highly suggestable.
Moochie's post was exactly what an NLP believer would cling to when defending it. Unfortunately, those type of brain farts don't happen to everyone, and most certainly don't happen all the time - otherwise poor Moochie would be freaking out. There are a lot of distractions out there to interrupt all the patterns we go through every day.
I've noticed Derren Brown likes to throw bones to the NLP crowd during some of his routines. I saw some pattern interrupts in 'The Heist,' and he really likes using the "handshake interrupt."