Sacked
I was sacked purely on the strength of one manager's opinion he gained from snooping on my conversation with a non-employee.
When asked how I was liking the job by the non-employee (a friend of mine), my reply was that they were not only an American company, but they operated as such, loud and clear, and I thought I may begin looking elsewhere because it wasn't sitting easy with me.
Said manager confronted me with a transcript of the conversation and sacked me. The CCTV in the foyer recorded audio as well as video...
I'd name the company, but I suspect that it would result in this Post not making it past a Moderator (and on one person's word, I would probably jump on the Post as well). Suffice it to say - it is a real thing and it hurts. Okay, by the time I was sacked (the day after I had that conversation in the foyer), I was convinced by a good night's sleep that I would start looking elsewhere, but being summarily fired meant having to start my search that day as an unemployed person. Annoying.
I realised a couple of years later that I could have, and SHOULD have, sued, but I was now working for a proper employer by that time and having resolved to make the job interview process as much about interviewing the employer than being interviewed - I let it go.
But I wish I could name the offending employer (and the manager!).