Definitely guilty of this, courtesy of Signal's latest release notes.
MS Teams pops up a "Your microphone is muted" reminder when it "hears you talking" while you're muted.
Now that's a useful feature!
(... as you just stated above.)
For me it's realising a few particular people are there and muttering 'Oh, who let that cunt in here' and every one else wonders if I mean them.