Sometimes I wonder what the most extreme, strict, adherence to Okrandian canon might look like. I picture people asserting that it’s not enough to simply use sentences composed by Dr. Okrand as examples of well-formed grammatical sentences, but that *only* full sentences that were composed by Dr. Okrand, so you could say {nIn 'ar wIghaj} but not {nIn 'ar boghaj} or {nav 'ar wIghaj} and everybody just uses the same sentences over and over again to mean different things and the situation starts to resemble the Tamarians from “Darmok” and everybody knows that {nuqDaq yuch Dapol} is only really a question about chocolate in the most limited of circumstances.
One of the reasons I started learning Klingon in high school was
because one of my best friends and I wanted a secret language we could
converse in without other people in our social circle understanding
what we were saying, and we were both Star Trek fans. Obviously, I
took it much further than she did. :-) Nevertheless, she learned
enough to have memorised certain phrases, and these became our little
injoke. She never got the prefix system, but memorised certain
sentences with fixed prefixes ({pIpIH}, {HIghoS}, etc.) which she'd
use correctly, either alone or in a mixed English-Klingon sentence.
For example -- mutual friend to me: "We're having a party on Sunday at
so and so's."; she to me: {pIpIH}, meaning "you're invited". Yes, she
could only say "We are expecting you (sing.)", and not "I am expecting
you (sing.)" or "we are expecting you (pl.)", etc. You'd be surprised
at how much you can communicate using nothing but sentence fragments
from TKD, CK, PK, and a mixture of English, if you allow a high
tolerance for error (for example, I'd understand "{HIghoS} cafeteria"
to mean "come with me to the cafeteria" if she was with me, or "come
to me, I'm in the cafeteria" if she was calling me).