My 2-year-old son is the happiest, sweetest little boy. He was diagnosed with autism about 6 months ago by a pediatric neurologist, who we saw because he has zero communication skills (verbal or otherwise). He is almost always remarkably happy, and we love that about him. However, as you may imagine, it's impossible to discipline him, because he doesn't understand when you are disappointed or say "no" firmly. He thinks it's funny. Everything is funny. I am not sure yet but if he can go through his entire life successfully and mostly independently, and maintain the ability to enjoy literally every waking moment so greatly, I would go so far as to say I envy his innate joy. If I could ask him, I wonder if he would want to feel disappointment or sadness the way I do.