#1 - Concepts often elude them.
(This morning as Mark is in the bathroom, Maya is laying on her stomach outside the locked door, peering under the crack at the bottom and yelling at full volume...)
"DADDY!! DO YOU WANT SOME PRIVACY?!?"
#2 - Reasoning with them is futile.
(Yesterday, after she requested raisins for her afternoon snack, and I walked by to notice that she had eaten half of them and left the other half neatly in one side of her bowl...)
Me: "Are you going to finish your raisins?"
Maya: "No, these ones are yucky."
Me: "They're yucky? Why?"
Maya: "Because I don't want to eat them."
Me: "Why don't you want to eat them?"
Maya: "Because they're yucky."
Me: "Ok, but why are those raisins yucky?"
Maya: "Because we should throw them away."
Me (taking deep breath, trying one more time): "Ok, what makes them yucky?"
Maya (shooting me an exasperated look): "Me!"
[I give up]