The increasingly common situation where an individual on a conference orvideo call talks extensively without remembering to turn on their microphone. Also an excuse for situations where that same person wasn't paying attention to the call whatsoever. This situation is most common in conference call scenarios although it can also be seen in video conferences, particularly in the current work-from-home environment.
"Jamie? Jamie?? You there? We need your approval to allow the project to start."
(long pause)
"Oops, sorry, guys. Talking to mute again." (with the sound of toilet flushing in the background)