They ask for something and then proclaim that they are no longer hungry or no longer want what they asked for.
They watch the same thing over and over and over again for weeks and then all of a sudden they don’t like it or it is for babies.
They are only scared of the dark when people are paying attention when I am busy they will happily go into a darkened room to retrieve something however if I am there they are terribly afraid and I need to go with them
They misbehave at the most inappropriate times and then apologise for it knowing full well that they have left you in a very bad situation in public etc.
They are always bored no matter how many toys they have
They know exactly which buttons to push to pull on the string that makes you feel guilty
They will ask you a question when they know full well the answer
They will fight like cat and dog for something that there is 2 of but they both have to have that one
Lastly they have the ability to mirror the characteristics you like the least in your own person.