How do you keep your kids calm in the waiting room?

My friend Nicolette is waiting with her 3 year old, so I sang them You Are My Sunshine, then the opening opera from the movie Mrs Doubtfire. After my Robin Williams imitation the baby goes, How did he do that? Lol

I remember mom entertaining me around her age as we sat in the waiting room by playing hangman. Rather morbid game, in retrospect, but it did the job.