Siblings Hannah and Dan are the world's worst brother and sister. The pair's not-so-great traits include being obnoxious, lazy, self-centred, underachieving and incompetent. With a list like that, is it any wonder that they tend to cause chaos and disaster wherever they go? Hannah and Dan's behaviour don't just affect them, much to the chagrin of friends, family and even strangers who cross paths with the siblings - all of whom suffer the consequences of being associated with the duo due to their selfishness and idiocy. It doesn't matter who it is, if someone interacts with Hannah and Dan, they are destined for chaos.