Why?

I am tapping in to my inner child today and have five very important "why" questions that I need answers to ASAP.

1. Why, after eating their own food (or not), do children insist on interfering with your meal? Suddenly, the same food that they whined was "yucky" and claimed "don't YIKE it", is the best thing ever & they feel compelled to clean YOUR plate for you...
Example: This morning, I was a slacker and toasted up some Eggo's for breakfast. Michael asked for oatmeal which he got. Liam ate some oatmeal and one waffle, then claimed he was "all done". I had eaten one waffle and was still hungry so I made another to enjoy is semi-peace. Until Liam comes back to the kitchen, eyes up my waffle and asks for "a bite"...he ate at least half of my waffle...WHY???

2. Why does it seem that routine, everyday tasks are the cause of the biggest tantrums? I thought the theory is that children thrive on structure and routine. Our weeks are pretty routine and yet, EVERY morning/afternoon, some minute aspect of our daily routine is cause for significant tantrum time.
Examples: Turning off the TV so we can leave, getting dressed, leaving daycare. WHY???

3. Why does it seem that when I speak in a calm voice, using appropriate language, my children fail to comply? In fact, they do the EXACT opposite of what I am asking. Then, when I YELL my fool head off & say things in a rather demanding (or downright mean) way, they suddenly do what needs to be done.
Example: Too many to mention but if I ask someone to come over to me so they can get dressed or something like that, they don't move a muscle or run away until I am screaming. WHY???

4. Why do children repetitively ask the very question that you just answered? Over and over and over and over again? My only successful response is to repeat my answer one last time and then tell them that Mommy is "all done talking about that".
Don't get me wrong, if there are DIFFERENT questions about the same topic, that's fine but there are only so many times I can tell you that the police man has his lights on because someone was driving too fast (or whatever the situation was)
Example: I doubt you need them.
WHY???

5. Why does my potty-trained child always delay going to the potty until we are already in the midst of a meal and then SUDDENLY...I HAVE TO PEE!! Then he has to go to the bathroom, rewash his hands, etc. I know it's such a small thing but it drives me batty!
WHY???

Those are my top 5 for the moment...there are so many more but those are the ones that jumped out at me today.

Feel free to answer or just add your own "Why" questions too