I was half-watching something on TV, where they used some stock 1980s footage of computer room operations. Something seemed vaguely familiar, and I realized I was reading the main MVS operator's console. I was watching the job starts, stops, tape mounts, start and end of printing, etc. I wasn't paying attention, it just activated some part of my brain.
Another time, I had something on the History Channel running while I was sitting here freeping. I realized I was listening to, and understanding, the soundtrack of a German newsreel. My German is exceedingly rusty, but newsreel scripts, like Church Latin, were written in basic, easy-to-understand forms.
I have problems with suspension-of-disbelief when watching movies, and there are are these technical gaffes with weapons, or poor special effects, that immediate catch my attention, even though I want to watch the movie and enjoy myself. I didn't have any problems like that with the LOTR movies, because no gross blooper made it to the screen.
If you don't count that VW 'bug' in the shire, of course.