Bets anyone?

Every night after dinner for the last two or three years, we have watched a TV show (or two). Tonight, for some reason, my children have discovered their toys. I keep pointing out that it is getting close to bedtime, and they might want to start picking up so they could start their show, they keep telling me they are having too much fun. So I finally told C, "OK, but I don't want any tears if there isn't time for a show before bed." And he cheerfully told me "OK, there won't be."

Any bets on how many minutes of hysteria there will be when I announce bedtime without a show?