Nobody watches, everybody at the table plays, no exceptions! I broke this rule EXACTLY one time since 1977 and sure enuf it was a problem. I let a guy sit in to see what the game was like, he started a loud side conversation and I went off on him. I lost a player and reminded myself how important it was. I even made the 60 year old mother of a 17 year old girl play when she wanted to check us out. She did pretty good for a civilian. Be firm with this one!