Disclaimer: First of all, I don't know (even anywhere near) all the answers. My kids act up on a regular basis. They have all the traits that you find in "normal" kids. But, here's some conclusions that I've come to in observing their behavior. They're still young, and have many years to go before leaving home, so things may change! But, there are a few things I've discovered (mostly by accident) that can really shape their behavior for good and for bad.
I can see why people only want 1-2 kids, because these things are commonplace in most homes, leading kids to behave naughtily when it isn't "just kids" or the child's fault at all. This drives the parent bonkers (the excess noise, recklessness, and fighting is unbearable). If my kids were like this every day, I'd have quit long ago too!
1) Sugar. That evil villain sugar. Somehow it turns off their ears (well, they can still hear, but the messages don't get to their brain). They can't stay on task. They can't do what they're asked. They get whiny. One certain little girl can't sit still and cries much more...all day. She also can't fall asleep at night (because her legs wiggle so bad) and she wets the bed. We've had 2 profound instances where this was so blatantly obvious, that you can't deny it was the sugar (and chocolate combined, in our case). When one of our boys was 1 1/2, we bought him chocolate milk. You know, the cute little cartons? Yes, well, he drank it and was buzzing around the house non-stop until 1 a.m. (a good 6 hours) And I mean buzzing. Last summer we gave a different 1 year old a bit of a fudgesicle off of the one I was eating. One small, nickel-sized bite before bed. This little guy (who normally slept most nights) fell asleep as usual at 8, but within the hour was back awake, and proceeded to buzz around the house for 6 hours. That's 9 p.m. to 3 a.m. From one little bite. Coincidence? I think not. This past weekend we went camping, and the kids all had more sugar than necessary (well, we all did!) and it's now Tuesday and the kids are finally starting to get back to normal behavior. Just not worth the "fun" of some yummy treats, although I always try to convince myself that it won't matter that much.
Last week we were visiting some family, who repeatedly commented on how good our kids were, and what a pleasure to have around (unlike their unruly grand-kids and great-grand-kids). Well, after an afternoon there (and full doses of pop, ice cream and cookies) our kids were also a nightmare on the ride home. Kicking the seats, crying, whining, fighting and the works. If only they knew that they likely bring on alot of the kid's bad behavior with the overabundance of sweets offered.
2) TV/videos/electronic games. Yep, somehow that turns kids into belligerent brats. They somehow think they don't have to listen to their parents any more and think that they own the show. One little boy in our house actually kicked me in the leg when I tried to turn off a video on him one time (they had even already watched the movie and it was running through a second time by accident when I turned it off). That sweet little boy who would never think of doing such a thing to his mother. They seem to get so engrossed in it that reality fades into oblivion and their "dream world" becomes reality. Because of this, strictly limiting screen time is of utmost importance. (like 15-30 min/ week maximum!) Sounds extreme, but if I get lazy and let them have more, I get the Jekyll & Hyde effect. Which I don't care for at all! The only exception to this is documentaries. They are hard to get addicted to, so we do let them watch them if given an option. Plus, they're learning while watching so it's a win/win situation.
The rest is easy. Let them know expectations before you get somewhere (grocery shopping, church, doctor's office, etc.) and the consequences for not following instructions. Lots of hugs and cuddles to keep their love tanks full (it's often surprising how much bad behavior is just a need for attention). Praise the good, deal with the bad immediately. Try not to whine or nag or cajole or bribe or yell. Never spank when they (or you) are hungry or tired, or you are angry. When you see other kids acting up, remind your own what will happen if they ever act that way (this works amazingly well!) And your kids will be a pleasure for you and others to have around! Any more things that work for you??
One last thought from my a friend's facebook today:

