A quick Google (ironically) confirms this has happened, beyond the anecdotal evidence of people (including me) who remember it on several occasions.
https://www.mediaite.com/news/ex-google-engineer-says-glitch...
I'm not making any comment on the theory in the article, but it has certainly happened.
Edit: more context in thread here:
https://news.ycombinator.com/item?id=31161790