3.5 year olds!!!!!!!!!!!!!!!!

What is wrong with them that makes them do the craziest things? I mean what sane, rational person would repeatedly touch things that someone over twice their size consistently tells them not to? Why do they touch, break, step on, step in, pee on, fall on, lose, leave laying in the floor throughout the house all the things we've told them over and over again not too? Are they deaf, brain-dead, or what?
And how is it they genuinely looked shocked when you yell at them for the 50th time for doing one of the above? I know their memory is better than that. They remember the bad word we said 3 weeks ago but can't remember that we told them 5 minutes ago not to stand on item A because they'll fall and hit their head, arm, leg, butt, etc on item B!!!! But yet they do it anyway then come screaming to us like the world is ending.
I now know why in Bill Cosby's stand up comedy documentary "Himself" why he said his children can't go to bed at night without having a good beating. Oh back then I thought it was funny but now, I know...