And on record, I have never seen anything like that. There are two players in a game. If neither catches it, then you are watching the same two bad players.
I will admit that sometimes I add a threat for
Captured By the Ring but can't see
Fat One Wants It in the crowded support area of a Ninja Gollum deck, or that I move and say "Shadow Phase" before exerting for the
Under the Watching Eye in play, but when the mistake is realized, it is easily correctable and most players don't have a problem with it.
Another classic is healing at sanctuaries. Sometimes you will move and say, "Oh #$&*@!, do you mind if I heal?" Keep in mind the game is being played on a computer screen. You aren't touching actual cards. And with all the talk about new formats, etc., being created, who is to say that some #$&*@! didn't decide that
Fat One Wants It is not unique for their game?
If it is a huge problem, get involved. Otherwise, stay on the sidelines and don't worry about it.
-wtk