For example: When searching for something innocent like a person's name or nickname and you get images that you don't want children to see. I was searching an image with a person's name and got images that I can't tell you about, here, as I would get flagged for just stating it.
Or watching a video on YouTube about something and saw something and heard some horrible things on there, that you wished that you could un-see. I was in shock when I heard and saw something that YouTube allowed to post that, anyone to see, even children. I can't state what that was, without getting flagged, but it was bad.
I wish Google and YouTube would do a better job of blocking images that are not meant for children.