You know what's weird? When your kid does something that other people would consider completely normal, but you know it's just a little off. I've seen it happen before with other parents. One mom will say, "did you see what [insert their child's name] just did? Wasn't that a little odd?" Then the other mom says, "Uhm. No. I didn't notice anything." The next thing you know, kid A (the one "acting a little odd") winds up sick as a dog.
Take last night for example. When we were getting ready for bed Eliot was just not quite as belligerent as he usually is. To the untrained eye he would have seemed sufficiently belligerent, but I knew there was something a tiny bit askew. Then he wanted cold water instead of his normal room temperature water. Also, he wanted his animals to be arranged on his side instead of around his head. You know, nothing too terribly strange for any other kid, but for him - weird. Sure enough, about 2:00 am he came running into our room crying. He had had a nightmare. When I picked him up he was blazing hot. I fed him some motrin, emailed work to tell them I wouldn't be in and snuggled up with him in his bed. He slept until almost 9:00 today.
I really knew the night before that he was going to be sick, when he was acting funny. It's like having ESP. It's not just when they are sick, either. I can tell if it's going to be a good day or a bad day by the way he looks at me first thing in the morning. Just one small glance and I can tell. It's kinda neat when you know your kid so well that you can pretty much predict the future.