Unfortunately, one web conferencing service defaults to “Video On.”
If you don’t know this and don’t have your camera covered, you are in for a surprise.
This happened to me at work, but in a more innocent way. The meeting had been going on for 20 minutes when I realized the top part of my head was occasionally getting in view for the remote company. I had logged into their setup.
And so are the others on the call! LOL