> and we didn't hear a words they were saying because we expected them
> to talk English.
That's one I know well, You have no clue while your mind tries to parse
the wrong language. I once heard physics lectures by a Chinese professor
with, for one reason or another, a Dutch accent. Whenever a word eluded
him he seamlessly switched from German with a Dutch accent into English
with a Dutch accent. It was absolutely perfect English and quite easy to
understand, but until I caught on it was pure gobbledegook to me.
Happened every time and hardly got better during the semester.