Do you think a five year old is old enough to "misbehave"?

i know that five year olds know what is right and wrong to a degree...even two year olds know to some degree some stuff that is wrong and right, i babysit a two year old, three year old, four and six year old....and they ALL know what is right and wrong,,,,if they dont then they learn by the first time they do what is wrong...