It is bad to be selfish and self centered
Adam and his four friends are sitting at the table where there is a tray of 30 cookies.
Adam wants to eat twenty cookies.
Adam takes a few cookies and then orders more for himself from the waiter.
Adam takes 20 cookies quickly off the tray and stashes them in his jacket.
Adam's friends each get their fair share of cookies and are happy.
Adam's friends get very upset and demand he give them back and be fair.