I've failed a FizzBuzz.
While failing interviews is basically my superpower, I think my git repositories, college graders, previous and subsequent employers, coworkers and clients might be somewhat shocked to learn that all that code was written by a guy who "couldn't code" at all.
(The autograders and CI accepting all that non-code must have been exceptionally buggy.)
But still, I failed the test. I told a friend who'd had the slot a couple hours after mine; she thought I was joking. It's FizzBuzz!
I'd seen it before. I knew what it was. The guy had changed the strings and added a factor, but who cares. I could write it in my sleep.
Just not in the form of a puddle of goo, which is pretty much the form I took in this interview. My functional IQ was roughly on par with that of my socks.
I could tell you why it happened, but it doesn't really matter. Now that interviewer had a story of the time a guy with FAANG on his resume (whose name alone had gotten me the interview) was totally incompetent.
These comments are full of those stories, mostly being used to show the test is fine and everybody sucks.