I still have nightmares about the accent of the TA running the linear algebra class I took in college 20ish years ago. He was a Vietnamese man speaking "perfec

I still have nightmares about the accent of the TA running the linear algebra class I took in college 20ish years ago. He was a Vietnamese man speaking "perfect" English, but not in a way that could be understood by virtually anyone, and I'm usually pretty good with understanding strong accents. I have nothing against people with accents, I'm friends with and co-worker with quite a few people who have significant accents but are still understandable. However, there are certainly cases where accents are so strong that the person is arguably not really speaking the language even if their grammer is impeccable. And I say that fully understanding that the same applies if I find myself for any reason butchering the French language or Mandarin Chinese verbally.